menu_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".MainActivity">

    <item android:id="@+id/action_create_order"
        android:title="@string/action_create_order"
        android:icon="@drawable/ic_action_new_event"
        android:orderInCategory="1"
        app:showAsAction="ofRoom"/>

    <item android="@+id/action_settings"
        android:title="@+string/action_settings"
        android:orderInCategory="100"
        app:showAsAction="never"/>
</menu>