SBC_Main_Android/app/src/main/res/layout/layout_sub_module.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:layout_gravity="center_vertical"
    android:background="@color/color_blue_800"
    android:orientation="vertical"
    tools:context=".screen.main.MainFragment">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center">

        <com.google.android.material.button.MaterialButton
            android:id="@+id/close_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:padding="5dp"
            android:text="@string/close"
            android:textSize="16sp" />
    </LinearLayout>

</RelativeLayout>