RetroMusicPlayer/app/src/main/res/layout/activity_about.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <code.name.monkey.retromusic.views.StatusBarView
        android:id="@+id/status_bar"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="?attr/colorSurface"
        tools:ignore="UnusedAttribute" />

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?attr/colorSurface">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorSurface"
            app:liftOnScroll="true">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/toolbar"
                style="@style/Toolbar"
                android:background="?attr/colorSurface"
                app:layout_collapseMode="pin"
                app:navigationIcon="@drawable/ic_keyboard_backspace_black_24dp"
                app:title="@string/action_about"
                app:titleTextAppearance="@style/ToolbarTextAppearanceNormal" />

        </com.google.android.material.appbar.AppBarLayout>

        <androidx.core.widget.NestedScrollView
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:overScrollMode="never"
            app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">

            <include layout="@layout/activity_about_content" />
        </androidx.core.widget.NestedScrollView>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>
</LinearLayout>