ns-usbloader-mobile/app/src/main/res/menu/activity_main_toolbar.xml

<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    >
    <item
        android:id="@+id/select_all"
        android:title="@android:string/selectAll"
        app:showAsAction="never" />
</menu>