You need to Create a file .

res/menu/overflow_menu.xml

overflow_menu.xml File Here:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/aboutFragment"
        android:title="@string/about" />

</menu>