How to Turn off a Chromebook Screen When Connected to an External Display
Joe Fedewa | Google
Hooking your Chromebook up to an external display is a great way to be more productive. With a Bluetooth mouse and keyboard, you’ve got a desktop experience. The Chromebook display may seem redundant in this case, so you can turn it off.
There are two ways to use a Chromebook with an external display. The extra display can be a secondary screen independent of the Chromebook display, or you can mirror your Chromebook’s display.
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Next, go to the “Device” section and select “Displays.”