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

<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="match_parent">

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

        <FrameLayout
            android:id="@+id/viewer_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:descendantFocusability="blocksDescendants" />

        <androidx.compose.ui.platform.ComposeView
            android:id="@+id/page_number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal" />

    </FrameLayout>

    <eu.kanade.tachiyomi.ui.reader.ReaderColorFilterView
        android:id="@+id/color_overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

    <eu.kanade.tachiyomi.ui.reader.ReaderNavigationOverlayView
        android:id="@+id/navigation_overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="false"
        android:focusable="false"
        android:visibility="gone" />

    <View
        android:id="@+id/brightness_overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

    <FrameLayout
        android:id="@+id/reader_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:theme="?attr/actionBarTheme"
        android:visibility="invisible"
        tools:visibility="visible">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="?attr/actionBarSize" />

        <androidx.compose.ui.platform.ComposeView
            android:id="@+id/reader_menu_bottom"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom" />

    </FrameLayout>

    <androidx.compose.ui.platform.ComposeView
        android:id="@+id/dialog_root"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>