path: root/res/menu/launcher_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".LauncherActivity">

    <item
        android:id="@+id/btnLaunchSettingsActivity"
        android:title=""
        android:icon="@drawable/cog_outline"
        android:showAsAction="always" />
</menu>