In Desktop Mode, open the Settings app; select the Display menu from the lefthand pane. If your display's recognized, you'll see two boxes on this screen. Click on the one not labeled "Built In Display" for extra settings.
In Desktop Mode, open the Settings app; select the Display menu from the lefthand pane. If your display's recognized, you'll see two boxes on this screen. Click on the one not labeled "Built In Display" for extra settings.