diff --git a/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt b/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
index 0b9f503..51464d0 100644
--- a/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
+++ b/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
@@ -73,6 +73,7 @@
 import com.android.systemui.res.R
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.scene.ui.composable.ComposableScene
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.shade.ui.viewmodel.ShadeSceneViewModel
 import com.android.systemui.statusbar.phone.StatusBarIconController
 import com.android.systemui.statusbar.phone.StatusBarIconController.TintedIconManager
@@ -152,27 +153,29 @@
     mediaHost: MediaHost,
     modifier: Modifier = Modifier,
 ) {
-    val isSplitShade by viewModel.isSplitShade.collectAsState()
-    if (isSplitShade) {
-        SplitShade(
-            viewModel = viewModel,
-            createTintedIconManager = createTintedIconManager,
-            createBatteryMeterViewController = createBatteryMeterViewController,
-            statusBarIconController = statusBarIconController,
-            mediaCarouselController = mediaCarouselController,
-            mediaHost = mediaHost,
-            modifier = modifier,
-        )
-    } else {
-        SingleShade(
-            viewModel = viewModel,
-            createTintedIconManager = createTintedIconManager,
-            createBatteryMeterViewController = createBatteryMeterViewController,
-            statusBarIconController = statusBarIconController,
-            mediaCarouselController = mediaCarouselController,
-            mediaHost = mediaHost,
-            modifier = modifier,
-        )
+    val shadeMode by viewModel.shadeMode.collectAsState()
+    when (shadeMode) {
+        is ShadeMode.Single ->
+            SingleShade(
+                viewModel = viewModel,
+                createTintedIconManager = createTintedIconManager,
+                createBatteryMeterViewController = createBatteryMeterViewController,
+                statusBarIconController = statusBarIconController,
+                mediaCarouselController = mediaCarouselController,
+                mediaHost = mediaHost,
+                modifier = modifier,
+            )
+        is ShadeMode.Split ->
+            SplitShade(
+                viewModel = viewModel,
+                createTintedIconManager = createTintedIconManager,
+                createBatteryMeterViewController = createBatteryMeterViewController,
+                statusBarIconController = statusBarIconController,
+                mediaCarouselController = mediaCarouselController,
+                mediaHost = mediaHost,
+                modifier = modifier,
+            )
+        is ShadeMode.Dual -> error("Dual shade is not yet implemented!")
     }
 }
 
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImplTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImplTest.kt
index 4fe45f6..8c9036a 100644
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImplTest.kt
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImplTest.kt
@@ -30,6 +30,7 @@
 import com.android.systemui.scene.domain.interactor.sceneInteractor
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.shade.data.repository.shadeRepository
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.testKosmos
 import com.android.systemui.user.data.repository.userRepository
 import com.google.common.truth.Truth
@@ -562,17 +563,17 @@
         }
 
     @Test
-    fun isSplitShade() =
+    fun shadeMode() =
         testScope.runTest {
-            val isSplitShade by collectLastValue(underTest.isSplitShade)
+            val shadeMode by collectLastValue(underTest.shadeMode)
 
-            shadeRepository.setSplitShade(true)
-            assertThat(isSplitShade).isTrue()
+            shadeRepository.setShadeMode(ShadeMode.Split)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Split)
 
-            shadeRepository.setSplitShade(false)
-            assertThat(isSplitShade).isFalse()
+            shadeRepository.setShadeMode(ShadeMode.Single)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Single)
 
-            shadeRepository.setSplitShade(true)
-            assertThat(isSplitShade).isTrue()
+            shadeRepository.setShadeMode(ShadeMode.Split)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Split)
         }
 }
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/startable/ShadeStartableTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/startable/ShadeStartableTest.kt
index cbb84da..31dacdd 100644
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/startable/ShadeStartableTest.kt
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/domain/startable/ShadeStartableTest.kt
@@ -24,6 +24,7 @@
 import com.android.systemui.kosmos.testScope
 import com.android.systemui.res.R
 import com.android.systemui.shade.domain.interactor.shadeInteractor
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.testKosmos
 import com.google.common.truth.Truth.assertThat
 import kotlinx.coroutines.test.runTest
@@ -42,20 +43,20 @@
     private val underTest = kosmos.shadeStartable
 
     @Test
-    fun hydrateSplitShade() =
+    fun hydrateShadeMode() =
         testScope.runTest {
             overrideResource(R.bool.config_use_split_notification_shade, false)
-            val isSplitShade by collectLastValue(shadeInteractor.isSplitShade)
+            val shadeMode by collectLastValue(shadeInteractor.shadeMode)
 
             underTest.start()
-            assertThat(isSplitShade).isFalse()
+            assertThat(shadeMode).isEqualTo(ShadeMode.Single)
 
             overrideResource(R.bool.config_use_split_notification_shade, true)
             fakeConfigurationRepository.onAnyConfigurationChange()
-            assertThat(isSplitShade).isTrue()
+            assertThat(shadeMode).isEqualTo(ShadeMode.Split)
 
             overrideResource(R.bool.config_use_split_notification_shade, false)
             fakeConfigurationRepository.onAnyConfigurationChange()
-            assertThat(isSplitShade).isFalse()
+            assertThat(shadeMode).isEqualTo(ShadeMode.Single)
         }
 }
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModelTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModelTest.kt
index 2e68d12..1c54961 100644
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModelTest.kt
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModelTest.kt
@@ -37,10 +37,12 @@
 import com.android.systemui.res.R
 import com.android.systemui.scene.domain.interactor.sceneInteractor
 import com.android.systemui.scene.shared.model.Scenes
+import com.android.systemui.shade.data.repository.shadeRepository
 import com.android.systemui.shade.domain.interactor.privacyChipInteractor
 import com.android.systemui.shade.domain.interactor.shadeHeaderClockInteractor
 import com.android.systemui.shade.domain.interactor.shadeInteractor
 import com.android.systemui.shade.domain.startable.shadeStartable
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.notification.stack.ui.viewmodel.notificationsPlaceholderViewModel
 import com.android.systemui.statusbar.pipeline.airplane.data.repository.FakeAirplaneModeRepository
 import com.android.systemui.statusbar.pipeline.airplane.domain.interactor.AirplaneModeInteractor
@@ -72,6 +74,7 @@
     private val testScope = kosmos.testScope
     private val sceneInteractor by lazy { kosmos.sceneInteractor }
     private val deviceEntryInteractor by lazy { kosmos.deviceEntryInteractor }
+    private val shadeRepository by lazy { kosmos.shadeRepository }
 
     private val mobileIconsInteractor = FakeMobileIconsInteractor(FakeMobileMappingsProxy(), mock())
     private val flags = FakeFeatureFlagsClassic().also { it.set(Flags.NEW_NETWORK_SLICE_UI, false) }
@@ -274,4 +277,19 @@
             assertThat(destinationScenes?.get(Swipe(SwipeDirection.Down))?.toScene)
                 .isEqualTo(Scenes.QuickSettings)
         }
+
+    @Test
+    fun shadeMode() =
+        testScope.runTest {
+            val shadeMode by collectLastValue(underTest.shadeMode)
+
+            shadeRepository.setShadeMode(ShadeMode.Split)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Split)
+
+            shadeRepository.setShadeMode(ShadeMode.Single)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Single)
+
+            shadeRepository.setShadeMode(ShadeMode.Split)
+            assertThat(shadeMode).isEqualTo(ShadeMode.Split)
+        }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenSceneViewModel.kt b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenSceneViewModel.kt
index d89523d..288ef3c 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenSceneViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/ui/viewmodel/LockscreenSceneViewModel.kt
@@ -23,6 +23,7 @@
 import com.android.systemui.deviceentry.domain.interactor.DeviceEntryInteractor
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.shade.domain.interactor.ShadeInteractor
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.notification.stack.ui.viewmodel.NotificationsPlaceholderViewModel
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
@@ -69,8 +70,8 @@
 
     /** The key of the scene we should switch to when swiping down from the top edge. */
     val downFromTopEdgeDestinationSceneKey: StateFlow<SceneKey?> =
-        shadeInteractor.isSplitShade
-            .map { isSplitShade -> Scenes.QuickSettings.takeUnless { isSplitShade } }
+        shadeInteractor.shadeMode
+            .map { shadeMode -> Scenes.QuickSettings.takeIf { shadeMode is ShadeMode.Single } }
             .stateIn(
                 scope = applicationScope,
                 started = SharingStarted.WhileSubscribed(),
diff --git a/packages/SystemUI/src/com/android/systemui/scene/ui/viewmodel/GoneSceneViewModel.kt b/packages/SystemUI/src/com/android/systemui/scene/ui/viewmodel/GoneSceneViewModel.kt
index a490fe2..451fd67 100644
--- a/packages/SystemUI/src/com/android/systemui/scene/ui/viewmodel/GoneSceneViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/scene/ui/viewmodel/GoneSceneViewModel.kt
@@ -25,6 +25,7 @@
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.shade.domain.interactor.ShadeInteractor
+import com.android.systemui.shade.shared.model.ShadeMode
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.SharingStarted
@@ -40,17 +41,17 @@
     shadeInteractor: ShadeInteractor,
 ) {
     val destinationScenes: StateFlow<Map<UserAction, UserActionResult>> =
-        shadeInteractor.isSplitShade
-            .map { isSplitShade -> destinationScenes(isSplitShade = isSplitShade) }
+        shadeInteractor.shadeMode
+            .map { shadeMode -> destinationScenes(shadeMode = shadeMode) }
             .stateIn(
                 scope = applicationScope,
                 started = SharingStarted.WhileSubscribed(),
-                initialValue = destinationScenes(isSplitShade = shadeInteractor.isSplitShade.value)
+                initialValue = destinationScenes(shadeMode = shadeInteractor.shadeMode.value)
             )
 
-    private fun destinationScenes(isSplitShade: Boolean): Map<UserAction, UserActionResult> {
+    private fun destinationScenes(shadeMode: ShadeMode): Map<UserAction, UserActionResult> {
         return buildMap {
-            if (!isSplitShade) {
+            if (shadeMode == ShadeMode.Single) {
                 this[
                     Swipe(
                         pointerCount = 2,
diff --git a/packages/SystemUI/src/com/android/systemui/shade/data/repository/ShadeRepository.kt b/packages/SystemUI/src/com/android/systemui/shade/data/repository/ShadeRepository.kt
index e050c0b..5c79e1e 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/data/repository/ShadeRepository.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/data/repository/ShadeRepository.kt
@@ -16,6 +16,7 @@
 package com.android.systemui.shade.data.repository
 
 import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.shade.shared.model.ShadeMode
 import javax.inject.Inject
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -100,8 +101,7 @@
     @Deprecated("Use ShadeInteractor.isQsBypassingShade instead")
     val legacyExpandImmediate: StateFlow<Boolean>
 
-    /** Whether the current configuration requires the split shade to be shown. */
-    val isSplitShade: StateFlow<Boolean>
+    val shadeMode: StateFlow<ShadeMode>
 
     /** True when QS is taking up the entire screen, i.e. fully expanded on a non-unfolded phone. */
     @Deprecated("Use ShadeInteractor instead") val legacyQsFullscreen: StateFlow<Boolean>
@@ -109,7 +109,7 @@
     /** NPVC.mClosing as a flow. */
     @Deprecated("Use ShadeAnimationInteractor instead") val legacyIsClosing: StateFlow<Boolean>
 
-    fun setSplitShade(isSplitShade: Boolean)
+    fun setShadeMode(mode: ShadeMode)
 
     /** Sets whether a closing animation is happening. */
     @Deprecated("Use ShadeAnimationInteractor instead") fun setLegacyIsClosing(isClosing: Boolean)
@@ -219,11 +219,11 @@
     @Deprecated("Use ShadeInteractor instead")
     override val legacyQsFullscreen: StateFlow<Boolean> = _legacyQsFullscreen.asStateFlow()
 
-    val _isSplitShade = MutableStateFlow(false)
-    override val isSplitShade: StateFlow<Boolean> = _isSplitShade.asStateFlow()
+    val _shadeMode = MutableStateFlow<ShadeMode>(ShadeMode.Single)
+    override val shadeMode: StateFlow<ShadeMode> = _shadeMode.asStateFlow()
 
-    override fun setSplitShade(isSplitShade: Boolean) {
-        _isSplitShade.value = isSplitShade
+    override fun setShadeMode(shadeMode: ShadeMode) {
+        _shadeMode.value = shadeMode
     }
 
     override fun setLegacyQsFullscreen(legacyQsFullscreen: Boolean) {
diff --git a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractor.kt b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractor.kt
index ad3fbe5..bc60c83 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractor.kt
@@ -16,6 +16,7 @@
 
 package com.android.systemui.shade.domain.interactor
 
+import com.android.systemui.shade.shared.model.ShadeMode
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
@@ -103,8 +104,7 @@
      */
     val isUserInteractingWithQs: Flow<Boolean>
 
-    /** Whether the current configuration requires the split shade to be shown. */
-    val isSplitShade: StateFlow<Boolean>
+    val shadeMode: StateFlow<ShadeMode>
 }
 
 fun createAnyExpansionFlow(
diff --git a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorEmptyImpl.kt b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorEmptyImpl.kt
index 57a36b5..e9bb4c6 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorEmptyImpl.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorEmptyImpl.kt
@@ -17,6 +17,7 @@
 package com.android.systemui.shade.domain.interactor
 
 import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.shade.shared.model.ShadeMode
 import javax.inject.Inject
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -42,5 +43,5 @@
     override val isUserInteracting: StateFlow<Boolean> = inactiveFlowBoolean
     override val isShadeTouchable: Flow<Boolean> = inactiveFlowBoolean
     override val isExpandToQsEnabled: Flow<Boolean> = inactiveFlowBoolean
-    override val isSplitShade: StateFlow<Boolean> = inactiveFlowBoolean
+    override val shadeMode: StateFlow<ShadeMode> = MutableStateFlow(ShadeMode.Single)
 }
diff --git a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorLegacyImpl.kt b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorLegacyImpl.kt
index 3bccd2b..6414af3 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorLegacyImpl.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorLegacyImpl.kt
@@ -21,6 +21,7 @@
 import com.android.systemui.keyguard.data.repository.KeyguardRepository
 import com.android.systemui.keyguard.shared.model.StatusBarState
 import com.android.systemui.shade.data.repository.ShadeRepository
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.notification.stack.domain.interactor.SharedNotificationContainerInteractor
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
@@ -99,7 +100,7 @@
     override val isUserInteractingWithQs: Flow<Boolean> =
         userInteractingFlow(repository.legacyQsTracking, repository.qsExpansion)
 
-    override val isSplitShade: StateFlow<Boolean> = repository.isSplitShade
+    override val shadeMode: StateFlow<ShadeMode> = repository.shadeMode
 
     /**
      * Return a flow for whether a user is interacting with an expandable shade component using
diff --git a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImpl.kt b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImpl.kt
index ad8c029..7785eda 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImpl.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/domain/interactor/ShadeInteractorSceneContainerImpl.kt
@@ -23,6 +23,7 @@
 import com.android.systemui.scene.domain.interactor.SceneInteractor
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.shade.data.repository.ShadeRepository
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.notification.stack.domain.interactor.SharedNotificationContainerInteractor
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
@@ -108,7 +109,7 @@
     override val isUserInteractingWithQs: Flow<Boolean> =
         sceneBasedInteracting(sceneInteractor, Scenes.QuickSettings)
 
-    override val isSplitShade: StateFlow<Boolean> = shadeRepository.isSplitShade
+    override val shadeMode: StateFlow<ShadeMode> = shadeRepository.shadeMode
 
     /**
      * Returns a flow that uses scene transition progress to and from a scene that is pulled down
diff --git a/packages/SystemUI/src/com/android/systemui/shade/domain/startable/ShadeStartable.kt b/packages/SystemUI/src/com/android/systemui/shade/domain/startable/ShadeStartable.kt
index 334908e..11ce818 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/domain/startable/ShadeStartable.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/domain/startable/ShadeStartable.kt
@@ -22,6 +22,7 @@
 import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.shade.data.repository.ShadeRepository
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.policy.SplitShadeStateController
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
@@ -41,17 +42,25 @@
 ) : CoreStartable {
 
     override fun start() {
-        hydrateSplitShade()
+        hydrateShadeMode()
     }
 
-    private fun hydrateSplitShade() {
+    private fun hydrateShadeMode() {
         applicationScope.launch {
             configurationRepository.onAnyConfigurationChange
                 // Force initial collection.
                 .onStart { emit(Unit) }
                 .map { applicationContext.resources }
                 .map { resources -> controller.shouldUseSplitNotificationShade(resources) }
-                .collect { isSplitShade -> shadeRepository.setSplitShade(isSplitShade) }
+                .collect { isSplitShade ->
+                    shadeRepository.setShadeMode(
+                        if (isSplitShade) {
+                            ShadeMode.Split
+                        } else {
+                            ShadeMode.Single
+                        }
+                    )
+                }
         }
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/shade/shared/model/ShadeMode.kt b/packages/SystemUI/src/com/android/systemui/shade/shared/model/ShadeMode.kt
new file mode 100644
index 0000000..3451eaf
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/shade/shared/model/ShadeMode.kt
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.shade.shared.model
+
+/** Enumerates all known modes of operation of the shade. */
+sealed interface ShadeMode {
+
+    /**
+     * The single or "accordion" shade where the QS and notification parts are in two vertically
+     * stacked panels and the user can swipe up and down to expand or collapse between the two
+     * parts.
+     */
+    data object Single : ShadeMode
+
+    /**
+     * The split shade where, on large screens and unfolded foldables, the QS and notification parts
+     * are placed side-by-side and expand/collapse as a single panel.
+     */
+    data object Split : ShadeMode
+
+    /**
+     * The dual shade where the QS and notification parts each have their own independently
+     * expandable/collapsible panel on either side of the large screen / unfolded device or sharing
+     * a space on a small screen or folded device.
+     */
+    data object Dual : ShadeMode
+}
diff --git a/packages/SystemUI/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModel.kt b/packages/SystemUI/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModel.kt
index 8084a6f..ea549f2 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/ui/viewmodel/ShadeSceneViewModel.kt
@@ -33,6 +33,7 @@
 import com.android.systemui.qs.ui.adapter.QSSceneAdapter
 import com.android.systemui.scene.shared.model.Scenes
 import com.android.systemui.shade.domain.interactor.ShadeInteractor
+import com.android.systemui.shade.shared.model.ShadeMode
 import com.android.systemui.statusbar.notification.stack.ui.viewmodel.NotificationsPlaceholderViewModel
 import java.util.concurrent.atomic.AtomicBoolean
 import javax.inject.Inject
@@ -64,12 +65,12 @@
         combine(
                 deviceEntryInteractor.isUnlocked,
                 deviceEntryInteractor.canSwipeToEnter,
-                shadeInteractor.isSplitShade,
-            ) { isUnlocked, canSwipeToDismiss, isSplitShade ->
+                shadeInteractor.shadeMode,
+            ) { isUnlocked, canSwipeToDismiss, shadeMode ->
                 destinationScenes(
                     isUnlocked = isUnlocked,
                     canSwipeToDismiss = canSwipeToDismiss,
-                    isSplitShade = isSplitShade,
+                    shadeMode = shadeMode,
                 )
             }
             .stateIn(
@@ -79,7 +80,7 @@
                     destinationScenes(
                         isUnlocked = deviceEntryInteractor.isUnlocked.value,
                         canSwipeToDismiss = deviceEntryInteractor.canSwipeToEnter.value,
-                        isSplitShade = shadeInteractor.isSplitShade.value,
+                        shadeMode = shadeInteractor.shadeMode.value,
                     ),
             )
 
@@ -96,8 +97,7 @@
                 initialValue = false
             )
 
-    /** Whether the current configuration requires the split shade to be shown. */
-    val isSplitShade: StateFlow<Boolean> = shadeInteractor.isSplitShade
+    val shadeMode: StateFlow<ShadeMode> = shadeInteractor.shadeMode
 
     /** Notifies that some content in the shade was clicked. */
     fun onContentClicked() = deviceEntryInteractor.attemptDeviceEntry()
@@ -119,7 +119,7 @@
     private fun destinationScenes(
         isUnlocked: Boolean,
         canSwipeToDismiss: Boolean?,
-        isSplitShade: Boolean,
+        shadeMode: ShadeMode,
     ): Map<UserAction, UserActionResult> {
         val up =
             when {
@@ -128,7 +128,7 @@
                 else -> Scenes.Lockscreen
             }
 
-        val down = if (isSplitShade) null else Scenes.QuickSettings
+        val down = Scenes.QuickSettings.takeIf { shadeMode is ShadeMode.Single }
 
         return buildMap {
             this[Swipe(SwipeDirection.Up)] = UserActionResult(up)
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/shade/data/repository/FakeShadeRepository.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/shade/data/repository/FakeShadeRepository.kt
index 6b604e1..728c67a 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/shade/data/repository/FakeShadeRepository.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/shade/data/repository/FakeShadeRepository.kt
@@ -18,6 +18,7 @@
 package com.android.systemui.shade.data.repository
 
 import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.shade.shared.model.ShadeMode
 import dagger.Binds
 import dagger.Module
 import javax.inject.Inject
@@ -60,8 +61,8 @@
 
     override val legacyLockscreenShadeTracking = MutableStateFlow(false)
 
-    private val _isSplitShade = MutableStateFlow(false)
-    override val isSplitShade: StateFlow<Boolean> = _isSplitShade.asStateFlow()
+    private val _shadeMode = MutableStateFlow<ShadeMode>(ShadeMode.Single)
+    override val shadeMode: StateFlow<ShadeMode> = _shadeMode.asStateFlow()
 
     @Deprecated("Use ShadeInteractor instead")
     override fun setLegacyIsQsExpanded(legacyIsQsExpanded: Boolean) {
@@ -136,8 +137,8 @@
         _legacyShadeExpansion.value = expandedFraction
     }
 
-    override fun setSplitShade(isSplitShade: Boolean) {
-        _isSplitShade.value = isSplitShade
+    override fun setShadeMode(shadeMode: ShadeMode) {
+        _shadeMode.value = shadeMode
     }
 }