simplauncher/app/src/main/res/layout/apps_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.recyclerview.widget.RecyclerView 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/appList"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginStart="16dp"
    android:layout_marginEnd="16dp"
    app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
    tools:listitem="@layout/apps_list_item" />