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It lets you save some space on your desk while also saving power and extending the lifespan of your Mac laptop display by preventing screen burn-in.

Portable Macintosh computers have a so-called “clamshell” mode – this allows you to close the lid of your portable Mac while running your desktop and programs on the external display. Turn off macbook screen when using external monitor To turn off your built-in PC display and push everything to your external display, select Second screen only. Step 3: You should see a sidebar showing four different display arrangement modes, namely PC screen only, Duplicate, Extend, and Second screen only. Step 2: Assuming that your PC and external display are connected, press the Windows and P keys in combination (Win+P). Step 1: Make sure that the Windows PC and your external display are connected to each other via a suitable connection method (VGA, DVI, HDMI, DisplayPort, etc.) and have been configured correctly. The following steps will show you how to quickly turn off your Windows PC display while keeping your external display running. This setting allows you to choose whether to keep your Windows desktop running on a single display, being duplicated on both built-in and external displays, or using the external display as an extension of your desktop from your computer. Windows computers let you customize your primary and secondary display when working with external displays. Turn off laptop screen when using external monitor windows 10