tachiyomi/app/src/main/res/layout/settings_search_controller.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clipToPadding="false"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        tools:listitem="@layout/settings_search_controller_card" />

    <FrameLayout
        android:id="@+id/progress"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:alpha="0.75"
            android:background="?attr/colorSurface" />

        <ProgressBar
            style="?android:attr/progressBarStyleLarge"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="center" />

    </FrameLayout>

</FrameLayout>