NewPipe-app-android/app/src/main/res/layout/activity_downloader.xml

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

    <include
        layout="@layout/toolbar_layout"
        android:id="@+id/toolbar_layout" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>