diff --git a/libs/WindowManager/Shell/res/drawable/decor_desktop_mode_maximize_button_dark.xml b/libs/WindowManager/Shell/res/drawable/decor_desktop_mode_maximize_button_dark.xml
new file mode 100644
index 0000000000000..02b707568cd06
--- /dev/null
+++ b/libs/WindowManager/Shell/res/drawable/decor_desktop_mode_maximize_button_dark.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2023 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.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportHeight="960"
+    android:viewportWidth="960">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M180,840Q156,840 138,822Q120,804 120,780L120,180Q120,156 138,138Q156,120 180,120L780,120Q804,120 822,138Q840,156 840,180L840,780Q840,804 822,822Q804,840 780,840L180,840ZM180,780L780,780Q780,780 780,780Q780,780 780,780L780,277L180,277L180,780Q180,780 180,780Q180,780 180,780Z" />
+</vector>
\ No newline at end of file
diff --git a/libs/WindowManager/Shell/res/layout/desktop_mode_app_controls_window_decor.xml b/libs/WindowManager/Shell/res/layout/desktop_mode_app_controls_window_decor.xml
index fb1980a526014..7e0c2071dc868 100644
--- a/libs/WindowManager/Shell/res/layout/desktop_mode_app_controls_window_decor.xml
+++ b/libs/WindowManager/Shell/res/layout/desktop_mode_app_controls_window_decor.xml
@@ -77,6 +77,19 @@
         android:layout_height="40dp"
         android:layout_weight="1"/>
 
+    <ImageButton
+        android:id="@+id/maximize_window"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:padding="9dp"
+        android:layout_marginEnd="8dp"
+        android:contentDescription="@string/maximize_button_text"
+        android:src="@drawable/decor_desktop_mode_maximize_button_dark"
+        android:scaleType="fitCenter"
+        android:gravity="end"
+        android:background="@null"
+        android:tint="@color/desktop_mode_caption_maximize_button_dark"/>
+
     <ImageButton
         android:id="@+id/close_window"
         android:layout_width="40dp"
diff --git a/libs/WindowManager/Shell/res/values/colors.xml b/libs/WindowManager/Shell/res/values/colors.xml
index f2a07857cd4ad..b2ec98bc1b155 100644
--- a/libs/WindowManager/Shell/res/values/colors.xml
+++ b/libs/WindowManager/Shell/res/values/colors.xml
@@ -64,6 +64,8 @@
     <color name="desktop_mode_caption_expand_button_dark">#48473A</color>
     <color name="desktop_mode_caption_close_button_light">#EFF1F2</color>
     <color name="desktop_mode_caption_close_button_dark">#1C1C17</color>
+    <color name="desktop_mode_caption_maximize_button_light">#EFF1F2</color>
+    <color name="desktop_mode_caption_maximize_button_dark">#1C1C17</color>
     <color name="desktop_mode_caption_app_name_light">#EFF1F2</color>
     <color name="desktop_mode_caption_app_name_dark">#1C1C17</color>
     <color name="desktop_mode_caption_menu_text_color">#191C1D</color>
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
index 2d7e6a602f2f9..8f04aa0f77c5b 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
@@ -372,6 +372,11 @@ public class DesktopModeWindowDecorViewModel implements WindowDecorViewModel {
                     mDesktopTasksController.ifPresent(c -> c.moveToNextDisplay(mTaskId));
                     decoration.closeHandleMenu();
                 }
+            } else if (id == R.id.maximize_window) {
+                final RunningTaskInfo taskInfo = decoration.mTaskInfo;
+                mDesktopTasksController.ifPresent(c -> c.toggleDesktopTaskSize(
+                        taskInfo, decoration));
+                decoration.closeHandleMenu();
             }
         }
 
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/viewholder/DesktopModeAppControlsWindowDecorationViewHolder.kt b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/viewholder/DesktopModeAppControlsWindowDecorationViewHolder.kt
index b67acd5c15bbe..672e57aab5adc 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/viewholder/DesktopModeAppControlsWindowDecorationViewHolder.kt
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/viewholder/DesktopModeAppControlsWindowDecorationViewHolder.kt
@@ -28,6 +28,7 @@ internal class DesktopModeAppControlsWindowDecorationViewHolder(
     private val openMenuButton: View = rootView.findViewById(R.id.open_menu_button)
     private val closeWindowButton: ImageButton = rootView.findViewById(R.id.close_window)
     private val expandMenuButton: ImageButton = rootView.findViewById(R.id.expand_menu_button)
+    private val maximizeWindowButton: ImageButton = rootView.findViewById(R.id.maximize_window)
     private val appNameTextView: TextView = rootView.findViewById(R.id.application_name)
     private val appIconImageView: ImageView = rootView.findViewById(R.id.application_icon)
 
@@ -37,6 +38,7 @@ internal class DesktopModeAppControlsWindowDecorationViewHolder(
         openMenuButton.setOnClickListener(onCaptionButtonClickListener)
         openMenuButton.setOnTouchListener(onCaptionTouchListener)
         closeWindowButton.setOnClickListener(onCaptionButtonClickListener)
+        maximizeWindowButton.setOnClickListener(onCaptionButtonClickListener)
         closeWindowButton.setOnTouchListener(onCaptionTouchListener)
         appNameTextView.text = appName
         appIconImageView.setImageDrawable(appIcon)
@@ -49,6 +51,8 @@ internal class DesktopModeAppControlsWindowDecorationViewHolder(
 
         closeWindowButton.imageTintList = ColorStateList.valueOf(
                 getCaptionCloseButtonColor(taskInfo))
+        maximizeWindowButton.imageTintList = ColorStateList.valueOf(
+                getCaptionMaximizeButtonColor(taskInfo))
         expandMenuButton.imageTintList = ColorStateList.valueOf(
                 getCaptionExpandButtonColor(taskInfo))
         appNameTextView.setTextColor(getCaptionAppNameTextColor(taskInfo))
@@ -70,6 +74,14 @@ internal class DesktopModeAppControlsWindowDecorationViewHolder(
         }
     }
 
+    private fun getCaptionMaximizeButtonColor(taskInfo: RunningTaskInfo): Int {
+        return if (shouldUseLightCaptionColors(taskInfo)) {
+            context.getColor(R.color.desktop_mode_caption_maximize_button_light)
+        } else {
+            context.getColor(R.color.desktop_mode_caption_maximize_button_dark)
+        }
+    }
+
     private fun getCaptionExpandButtonColor(taskInfo: RunningTaskInfo): Int {
         return if (shouldUseLightCaptionColors(taskInfo)) {
             context.getColor(R.color.desktop_mode_caption_expand_button_light)