diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index dea666b..4cdb5f8 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -15,6 +15,7 @@
  */
 package com.android.quickstep;
 
+import static android.accessibilityservice.AccessibilityService.GLOBAL_ACTION_ACCESSIBILITY_ALL_APPS;
 import static android.view.MotionEvent.ACTION_CANCEL;
 import static android.view.MotionEvent.ACTION_DOWN;
 import static android.view.MotionEvent.ACTION_UP;
@@ -47,7 +48,6 @@
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
-import android.graphics.Rect;
 import android.graphics.Region;
 import android.graphics.drawable.Icon;
 import android.os.Build;
@@ -87,7 +87,6 @@
 import com.android.launcher3.util.DisplayController;
 import com.android.launcher3.util.OnboardingPrefs;
 import com.android.launcher3.util.TraceHelper;
-import com.android.launcher3.util.WindowBounds;
 import com.android.quickstep.inputconsumers.AccessibilityInputConsumer;
 import com.android.quickstep.inputconsumers.AssistantInputConsumer;
 import com.android.quickstep.inputconsumers.DeviceLockedInputConsumer;
@@ -104,7 +103,6 @@
 import com.android.quickstep.util.ActiveGestureLog.CompoundString;
 import com.android.quickstep.util.ProtoTracer;
 import com.android.quickstep.util.ProxyScreenStatusProvider;
-import com.android.quickstep.util.SplitScreenBounds;
 import com.android.systemui.shared.recents.IOverviewProxy;
 import com.android.systemui.shared.recents.ISystemUiProxy;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
@@ -143,18 +141,7 @@
     private static final boolean BUBBLES_HOME_GESTURE_ENABLED =
             SystemProperties.getBoolean("persist.wm.debug.bubbles_home_gesture", true);
 
-    private static final String KEY_BACK_NOTIFICATION_COUNT = "backNotificationCount";
-    private static final String NOTIFY_ACTION_BACK = "com.android.quickstep.action.BACK_GESTURE";
     private static final String HAS_ENABLED_QUICKSTEP_ONCE = "launcher.has_enabled_quickstep_once";
-    private static final int MAX_BACK_NOTIFICATION_COUNT = 3;
-
-    /**
-     * System Action ID to show all apps.
-     * TODO: Use AccessibilityService's corresponding global action constant in S
-     */
-    private static final int SYSTEM_ACTION_ID_ALL_APPS = 14;
-
-    private int mBackGestureNotificationCounter = -1;
 
     private final TISBinder mTISBinder = new TISBinder();
 
@@ -265,12 +252,6 @@
             MAIN_EXECUTOR.execute(() -> mDeviceState.setDeferredGestureRegion(region));
         }
 
-        @Override
-        public void onSplitScreenSecondaryBoundsChanged(Rect bounds, Rect insets) {
-            WindowBounds wb = new WindowBounds(bounds, insets);
-            MAIN_EXECUTOR.execute(() -> SplitScreenBounds.INSTANCE.setSecondaryWindowBounds(wb));
-        }
-
         @BinderThread
         @Override
         public void onScreenTurnedOn() {
@@ -484,8 +465,6 @@
 
         // Temporarily disable model preload
         // new ModelPreload().start(this);
-        mBackGestureNotificationCounter = Math.max(0, Utilities.getDevicePrefs(this)
-                .getInt(KEY_BACK_NOTIFICATION_COUNT, MAX_BACK_NOTIFICATION_COUNT));
         resetHomeBounceSeenOnQuickstepEnabledFirstTime();
 
         mOverviewComponentObserver.setOverviewChangeListener(this::onOverviewTargetChange);
@@ -523,11 +502,11 @@
                     Icon.createWithResource(this, R.drawable.ic_apps),
                     getString(R.string.all_apps_label),
                     getString(R.string.all_apps_label),
-                    PendingIntent.getActivity(this, SYSTEM_ACTION_ID_ALL_APPS, intent,
+                    PendingIntent.getActivity(this, GLOBAL_ACTION_ACCESSIBILITY_ALL_APPS, intent,
                             PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE));
-            am.registerSystemAction(allAppsAction, SYSTEM_ACTION_ID_ALL_APPS);
+            am.registerSystemAction(allAppsAction, GLOBAL_ACTION_ACCESSIBILITY_ALL_APPS);
         } else {
-            am.unregisterSystemAction(SYSTEM_ACTION_ID_ALL_APPS);
+            am.unregisterSystemAction(GLOBAL_ACTION_ACCESSIBILITY_ALL_APPS);
         }
 
         StatefulActivity newOverviewActivity = mOverviewComponentObserver.getActivityInterface()
@@ -605,7 +584,7 @@
         ProtoTracer.INSTANCE.get(this).remove(this);
 
         getSystemService(AccessibilityManager.class)
-                .unregisterSystemAction(SYSTEM_ACTION_ID_ALL_APPS);
+                .unregisterSystemAction(GLOBAL_ACTION_ACCESSIBILITY_ALL_APPS);
 
         mTaskbarManager.destroy();
         sConnected = false;
diff --git a/quickstep/src/com/android/quickstep/util/SplitScreenBounds.java b/quickstep/src/com/android/quickstep/util/SplitScreenBounds.java
deleted file mode 100644
index 483a1c6..0000000
--- a/quickstep/src/com/android/quickstep/util/SplitScreenBounds.java
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * Copyright (C) 2020 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.quickstep.util;
-
-import static android.view.Surface.ROTATION_0;
-import static android.view.Surface.ROTATION_180;
-
-import android.annotation.TargetApi;
-import android.content.Context;
-import android.os.Build;
-import android.view.WindowManager;
-import android.view.WindowMetrics;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.annotation.UiThread;
-
-import com.android.launcher3.R;
-import com.android.launcher3.util.DisplayController;
-import com.android.launcher3.util.WindowBounds;
-
-import java.util.ArrayList;
-
-/**
- * Utility class to hold the information abound a window bounds for split screen
- */
-@TargetApi(Build.VERSION_CODES.R)
-public class SplitScreenBounds {
-
-    public static final SplitScreenBounds INSTANCE = new SplitScreenBounds();
-    private final ArrayList<OnChangeListener> mListeners = new ArrayList<>();
-
-    @Nullable
-    private WindowBounds mBounds;
-
-    private SplitScreenBounds() { }
-
-    @UiThread
-    public void setSecondaryWindowBounds(@NonNull WindowBounds bounds) {
-        if (!bounds.equals(mBounds)) {
-            mBounds = bounds;
-            for (OnChangeListener listener : mListeners) {
-                listener.onSecondaryWindowBoundsChanged();
-            }
-        }
-    }
-
-    public @NonNull WindowBounds getSecondaryWindowBounds(Context context) {
-        if (mBounds == null) {
-            mBounds = createDefaultWindowBounds(context);
-        }
-        return mBounds;
-    }
-
-    /**
-     * Creates window bounds as 50% of device size
-     */
-    private static WindowBounds createDefaultWindowBounds(Context context) {
-        WindowMetrics wm = context.getSystemService(WindowManager.class).getMaximumWindowMetrics();
-        WindowBounds bounds = WindowBounds.fromWindowMetrics(wm);
-
-        int rotation = DisplayController.INSTANCE.get(context).getInfo().rotation;
-        int halfDividerSize = context.getResources()
-                .getDimensionPixelSize(R.dimen.multi_window_task_divider_size) / 2;
-
-        if (rotation == ROTATION_0 || rotation == ROTATION_180) {
-            bounds.bounds.top = bounds.insets.top + bounds.availableSize.y / 2 + halfDividerSize;
-            bounds.insets.top = 0;
-        } else {
-            bounds.bounds.left = bounds.insets.left + bounds.availableSize.x / 2 + halfDividerSize;
-            bounds.insets.left = 0;
-        }
-        return new WindowBounds(bounds.bounds, bounds.insets);
-    }
-
-    public void addOnChangeListener(OnChangeListener listener) {
-        mListeners.add(listener);
-    }
-
-    public void removeOnChangeListener(OnChangeListener listener) {
-        mListeners.remove(listener);
-    }
-
-    /**
-     * Interface to receive window bounds changes
-     */
-    public interface OnChangeListener {
-
-        /**
-         * Called when window bounds for secondary window changes
-         */
-        void onSecondaryWindowBoundsChanged();
-    }
-}
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index eba2b6b..35414a6 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -178,7 +178,6 @@
 import com.android.quickstep.util.LayoutUtils;
 import com.android.quickstep.util.RecentsOrientedState;
 import com.android.quickstep.util.SplitAnimationTimings;
-import com.android.quickstep.util.SplitScreenBounds;
 import com.android.quickstep.util.SplitSelectStateController;
 import com.android.quickstep.util.SurfaceTransaction;
 import com.android.quickstep.util.SurfaceTransactionApplier;
@@ -210,7 +209,7 @@
 public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_TYPE>,
         STATE_TYPE extends BaseState<STATE_TYPE>> extends PagedView implements Insettable,
         TaskThumbnailCache.HighResLoadingState.HighResLoadingStateChangedCallback,
-        TaskVisualsChangeListener, SplitScreenBounds.OnChangeListener {
+        TaskVisualsChangeListener {
 
     private static final String TAG = "RecentsView";
     private static final boolean DEBUG = false;
@@ -948,7 +947,6 @@
         SystemUiProxy.INSTANCE.get(getContext()).setPipAnimationListener(
                 mIPipAnimationListener);
         mOrientationState.initListeners();
-        SplitScreenBounds.INSTANCE.addOnChangeListener(this);
         mTaskOverlayFactory.initListeners();
     }
 
@@ -965,7 +963,6 @@
         executeSideTaskLaunchCallback();
         RecentsModel.INSTANCE.get(getContext()).removeThumbnailChangeListener(this);
         SystemUiProxy.INSTANCE.get(getContext()).setPipAnimationListener(null);
-        SplitScreenBounds.INSTANCE.removeOnChangeListener(this);
         mIPipAnimationListener.setActivityAndRecentsView(null, null);
         mOrientationState.destroyListeners();
         mTaskOverlayFactory.removeListeners();
@@ -5209,12 +5206,6 @@
         return null;
     }
 
-    @Override
-    public void onSecondaryWindowBoundsChanged() {
-        // Invalidate the task view size
-        setInsets(mInsets);
-    }
-
     /** Enables or disables modal state for RecentsView */
     public abstract void setModalStateEnabled(boolean isModalState, boolean animate);