ISCS_BASE_APP/app/src/main/res/layout/activity_init.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">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/bg_main"
        android:fitsSystemWindows="true">

        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/nav_host_fragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="@dimen/iscs_space_4"
            app:defaultNavHost="true"
            app:navGraph="@navigation/nav_init" />
    </FrameLayout>
</layout>