Yes, you can rotate the screen of your external device following these steps. Press the clock button on your Chromebook's desktop screen to access the Chrome OS actin menu Click the gear from the context menu that just displayed on the settings icon Once you're in the settings menu, select Devices from the left-hand menu, then Displays from the right-hand menu Select your external display from the Display tab's drop-down menu Use the orientation drop-down box to rotate the screen according to your specifics.