diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/AbstractNavButtonLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/AbstractNavButtonLayoutter.kt
index 9758d44..7529508 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/AbstractNavButtonLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/AbstractNavButtonLayoutter.kt
@@ -46,7 +46,7 @@
         protected val startContextualContainer: ViewGroup,
         protected val imeSwitcher: ImageView?,
         protected val rotationButton: RotationButton?,
-        protected val a11yButton: ImageView
+        protected val a11yButton: ImageView?
 ) : NavButtonLayoutter {
     protected val homeButton: ImageView? = navButtonContainer.findViewById(R.id.home)
     protected val recentsButton: ImageView? = navButtonContainer.findViewById(R.id.recent_apps)
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/KidsNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/KidsNavLayoutter.kt
index f254ee8..e7847f3 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/KidsNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/KidsNavLayoutter.kt
@@ -35,7 +35,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView
+        a11yButton: ImageView?
 ) :
     AbstractNavButtonLayoutter(
             resources,
@@ -114,7 +114,9 @@
             startContextualContainer.addView(imeSwitcher)
             imeSwitcher.layoutParams = getParamsToCenterView()
         }
-        endContextualContainer.addView(a11yButton)
+        if (a11yButton != null) {
+            endContextualContainer.addView(a11yButton)
+        }
         if (rotationButton != null) {
             endContextualContainer.addView(rotationButton.currentView)
             rotationButton.currentView.layoutParams = getParamsToCenterView()
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/NavButtonLayoutFactory.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/NavButtonLayoutFactory.kt
index 7db1a37..c502cdb 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/NavButtonLayoutFactory.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/NavButtonLayoutFactory.kt
@@ -58,7 +58,7 @@
                 navButtonsView: FrameLayout,
                 imeSwitcher: ImageView?,
                 rotationButton: RotationButton?,
-                a11yButton: ImageView,
+                a11yButton: ImageView?,
                 resources: Resources,
                 isKidsMode: Boolean,
                 isInSetup: Boolean,
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneGestureLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneGestureLayoutter.kt
index c1dae40..d6ea7f0 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneGestureLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneGestureLayoutter.kt
@@ -31,7 +31,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView
+        a11yButton: ImageView?
 ) :
         AbstractNavButtonLayoutter(
                 resources,
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneLandscapeNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneLandscapeNavLayoutter.kt
index efe9d4b..54edd21 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneLandscapeNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneLandscapeNavLayoutter.kt
@@ -36,7 +36,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView,
+        a11yButton: ImageView?,
 ) :
     AbstractNavButtonLayoutter(
             resources,
@@ -113,7 +113,9 @@
             startContextualContainer.addView(imeSwitcher)
             imeSwitcher.layoutParams = getParamsToCenterView()
         }
-        startContextualContainer.addView(a11yButton)
+        if (a11yButton != null) {
+            startContextualContainer.addView(a11yButton)
+        }
         if (rotationButton != null) {
             startContextualContainer.addView(rotationButton.currentView)
             rotationButton.currentView.layoutParams = getParamsToCenterView()
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhonePortraitNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhonePortraitNavLayoutter.kt
index ad03e5b..34df282 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhonePortraitNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhonePortraitNavLayoutter.kt
@@ -35,7 +35,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView,
+        a11yButton: ImageView?,
 ) :
     AbstractNavButtonLayoutter(
             resources,
@@ -111,7 +111,9 @@
             endContextualContainer.addView(imeSwitcher)
             imeSwitcher.layoutParams = getParamsToCenterView()
         }
-        endContextualContainer.addView(a11yButton)
+        if (a11yButton != null) {
+            endContextualContainer.addView(a11yButton)
+        }
         if (rotationButton != null) {
             endContextualContainer.addView(rotationButton.currentView)
             rotationButton.currentView.layoutParams = getParamsToCenterView()
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneSeascapeNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneSeascapeNavLayoutter.kt
index fd6e991..cfe1276 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneSeascapeNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/PhoneSeascapeNavLayoutter.kt
@@ -31,7 +31,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView
+        a11yButton: ImageView?
 ) :
         PhoneLandscapeNavLayoutter(
                 resources,
@@ -63,7 +63,9 @@
             endContextualContainer.addView(imeSwitcher)
             imeSwitcher.layoutParams = getParamsToCenterView()
         }
-        endContextualContainer.addView(a11yButton)
+        if (a11yButton != null) {
+            endContextualContainer.addView(a11yButton)
+        }
         if (rotationButton != null) {
             endContextualContainer.addView(rotationButton.currentView)
             rotationButton.currentView.layoutParams = getParamsToCenterView()
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/SetupNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/SetupNavLayoutter.kt
index db245b8..36f5150 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/SetupNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/SetupNavLayoutter.kt
@@ -32,7 +32,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView
+        a11yButton: ImageView?
 ) :
     AbstractNavButtonLayoutter(
             resources,
@@ -72,7 +72,9 @@
             startContextualContainer.addView(imeSwitcher)
             imeSwitcher.layoutParams = getParamsToCenterView()
         }
-        endContextualContainer.addView(a11yButton)
+        if (a11yButton != null) {
+            endContextualContainer.addView(a11yButton)
+        }
         if (rotationButton != null) {
             endContextualContainer.addView(rotationButton.currentView)
             rotationButton.currentView.layoutParams = getParamsToCenterView()
diff --git a/quickstep/src/com/android/launcher3/taskbar/navbutton/TaskbarNavLayoutter.kt b/quickstep/src/com/android/launcher3/taskbar/navbutton/TaskbarNavLayoutter.kt
index 56e55bb..58dce69 100644
--- a/quickstep/src/com/android/launcher3/taskbar/navbutton/TaskbarNavLayoutter.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/navbutton/TaskbarNavLayoutter.kt
@@ -26,7 +26,10 @@
 import com.android.launcher3.R
 import com.android.systemui.shared.rotation.RotationButton
 
-/** Layoutter for showing 3 button navigation on large screen */
+/**
+ * Layoutter for rendering task bar in large screen. {@param isContextualButtonShowing} is true in
+ * 3-button mode.
+ */
 class TaskbarNavLayoutter(
         resources: Resources,
         navBarContainer: LinearLayout,
@@ -34,7 +37,7 @@
         startContextualContainer: ViewGroup,
         imeSwitcher: ImageView?,
         rotationButton: RotationButton?,
-        a11yButton: ImageView
+        a11yButton: ImageView?
 ) :
     AbstractNavButtonLayoutter(
             resources,
@@ -89,24 +92,28 @@
         endContextualContainer.removeAllViews()
         startContextualContainer.removeAllViews()
 
-        val endContextualContainerParams = FrameLayout.LayoutParams(
-                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT)
-        endContextualContainerParams.gravity = Gravity.END or Gravity.CENTER_VERTICAL
-        endContextualContainer.layoutParams = endContextualContainerParams
+        if (isContextualButtonShowing) {
+            val endContextualContainerParams = FrameLayout.LayoutParams(
+                    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT)
+            endContextualContainerParams.gravity = Gravity.END or Gravity.CENTER_VERTICAL
+            endContextualContainer.layoutParams = endContextualContainerParams
 
-        val startContextualContainerParams = FrameLayout.LayoutParams(
-                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT)
-        startContextualContainerParams.gravity = Gravity.START or Gravity.CENTER_VERTICAL
-        startContextualContainer.layoutParams = startContextualContainerParams
+            val startContextualContainerParams = FrameLayout.LayoutParams(
+                    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT)
+            startContextualContainerParams.gravity = Gravity.START or Gravity.CENTER_VERTICAL
+            startContextualContainer.layoutParams = startContextualContainerParams
 
-        if (imeSwitcher != null) {
-            startContextualContainer.addView(imeSwitcher)
-            imeSwitcher.layoutParams = getParamsToCenterView()
-        }
-        endContextualContainer.addView(a11yButton)
-        if (rotationButton != null) {
-            endContextualContainer.addView(rotationButton.currentView)
-            rotationButton.currentView.layoutParams = getParamsToCenterView()
+            if (imeSwitcher != null) {
+                startContextualContainer.addView(imeSwitcher)
+                imeSwitcher.layoutParams = getParamsToCenterView()
+            }
+            if (a11yButton != null) {
+                endContextualContainer.addView(a11yButton)
+            }
+            if (rotationButton != null) {
+                endContextualContainer.addView(rotationButton.currentView)
+                rotationButton.currentView.layoutParams = getParamsToCenterView()
+            }
         }
     }
 }