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

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:theme="?attr/actionBarTheme"
            app:contentInsetStartWithNavigation="0dp"
            app:menu="@menu/full_cover"
            app:navigationIcon="@drawable/ic_close_24dp" />

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

    <eu.kanade.tachiyomi.ui.reader.viewer.ReaderPageImageView
        android:id="@+id/container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:clipToPadding="false"
        android:clipChildren="false"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/appbar" />

</androidx.constraintlayout.widget.ConstraintLayout>