Thorium-android-app/app/src/main/res/layout/activity_settings.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar_settings"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/tool_bar_settings"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:elevation="4dp" />

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

    <FrameLayout
        android:id="@+id/settings"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>