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

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root_coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <eu.kanade.tachiyomi.widget.ElevationAppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="?attr/actionBarTheme"
            app:layout_scrollFlags="scroll|enterAlways|snap" />

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            style="@style/Theme.Widget.Tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <FrameLayout
            android:id="@+id/downloaded_only"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/green"
            android:visibility="gone"
            tools:visibility="visible">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:padding="4dp"
                android:text="@string/label_downloaded_only"
                android:textColor="@color/md_white_1000" />

        </FrameLayout>

    </eu.kanade.tachiyomi.widget.ElevationAppBarLayout>

    <com.bluelinelabs.conductor.ChangeHandlerFrameLayout
        android:id="@+id/controller_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
        android:id="@+id/root_fab"
        style="@style/Theme.Widget.FAB"
        android:visibility="gone" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_nav"
        style="@style/Widget.MaterialComponents.BottomNavigationView.Colored"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:itemIconTint="@color/bottom_nav_selector"
        app:itemTextColor="@color/bottom_nav_selector"
        app:labelVisibilityMode="labeled"
        app:layout_insetEdge="bottom"
        app:menu="@menu/bottom_nav" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>