maposition/app/src/main/res/menu/main_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menu_settings"
        android:title="Paramètres"
        android:showAsAction="always" />
</menu>