Magisk/app/src/main/res/layout/activity_main_md2.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <data>

        <variable
            name="viewModel"
            type="com.topjohnwu.magisk.redesign.MainViewModel" />

    </data>

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingLeft="@{viewModel.insets.left}"
        android:paddingRight="@{viewModel.insets.right}"
        tools:ignore="RtlHardcoded">

        <com.google.android.material.appbar.AppBarLayout
            style="?styleAppbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?colorSurfaceVariant"
            android:paddingTop="@{viewModel.insets.top}"
            tools:paddingTop="24dp">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/main_toolbar"
                style="?styleToolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="parent"
                tools:title="Home" />

            <View
                android:layout_width="match_parent"
                android:layout_height="3dp"
                android:layout_gravity="start|bottom"
                android:background="@drawable/bg_accent" />

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

        <FrameLayout
            android:id="@+id/main_nav_host"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior" />

        <com.google.android.material.bottomappbar.BottomAppBar
            android:id="@+id/main_bottom_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:background="?colorSurface"
            android:paddingBottom="@{viewModel.insets.bottom}"
            app:backgroundTint="?colorSurface"
            app:contentInsetEnd="0dp"
            app:contentInsetStart="0dp"
            app:fabCradleMargin="@dimen/l_50"
            app:hideOnScroll="true"
            tools:paddingBottom="48dp">

            <com.google.android.material.bottomnavigation.BottomNavigationView
                android:id="@+id/main_navigation"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                app:elevation="0dp"
                app:itemIconTint="@color/color_menu_tint"
                app:itemTextAppearanceActive="@style/AppearanceFoundation.Tiny.Bold"
                app:itemTextAppearanceInactive="@style/AppearanceFoundation.Tiny.Bold"
                app:itemTextColor="@color/color_menu_tint"
                app:labelVisibilityMode="unlabeled"
                app:menu="@menu/menu_bottom_nav" />

        </com.google.android.material.bottomappbar.BottomAppBar>

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@{viewModel.insets.bottom + (int) @dimen/l1}"
            app:fabSize="normal"
            app:layout_anchor="@+id/main_bottom_bar"
            app:srcCompat="@drawable/ic_superuser_md2" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</layout>