Update: AppBar corner design

src/main/res/drawable/background_recycler_bottom.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="?android:colorBackground" />
+    <corners
+        android:topLeftRadius="@dimen/shape_large_corner"
+        android:topRightRadius="@dimen/shape_large_corner" />
+</shape>

src/main/res/layout/fragment.xml

@@ -2,6 +2,7 @@
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/coordinator"
+    android:background="?colorSurface"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:elevation="0dp"
@@ -10,6 +11,7 @@
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appbar_layout"
         style="?attr/appBarLayoutStyle"
+        android:background="@android:color/transparent"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
 
@@ -37,6 +39,7 @@
         android:id="@+id/fragment_content"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="?android:attr/colorBackground"
+        android:background="@drawable/background_recycler_bottom"
+        android:backgroundTint="?android:colorBackground"
         app:layout_behavior="@string/appbar_scrolling_view_behavior" />
 </androidx.coordinatorlayout.widget.CoordinatorLayout>

src/main/res/values/styles.xml

@@ -95,7 +95,6 @@
     </style>
 
     <style name="Theme.AppBarLayout" parent="Widget.Material3.AppBarLayout">
-        <item name="android:background">@drawable/bottom_corner</item>
         <item name="android:backgroundTint">?attr/colorSurface</item>
         <item name="android:fitsSystemWindows">true</item>
     </style>