Close the computer lid after the computer desktop appears on the external display. Provided you've connected an external keyboard, mouse or both, the external display continues to display and your Mac doesn't go to sleep.
It's essential because you won't be able to use your external monitor if your Mac isn't powered on. Now, you can close your laptop, and your display will transfer to your external screen. Tip: Close the lid only when you see your Desktop on an external display.
On your laptop's desktop, right-click the battery icon. Select Power Options. On the left side of the Power Options page, select Choose what closing the lid does.
Connect an external mouse (can be wireless). Connect an external monitor. If you are using a Bluetooth mouse and keyboard, make sure that Bluetooth is on and that the peripherals are paired with the Mac. After your Mac notebook's Desktop appears on the external display, close the computer's lid.
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After your Mac notebook's Desktop appears on the external display, close the computer's lid. Your external monitor may flash off for a moment but it will then show your Desktop (you may need to wake your Mac by pressing a key on the keyboard or moving the mouse).
Connect power cable to the MacBook or via the USB-C hub One of the mandatory things to do in clamshell mode is we need to connect the power cable to the MacBook to be able to use the notebook while the display is closed. You can connect power cable via a hub or directly to MacBook's available port.
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On Windows 10, right-click the Battery icon > Power Options > Choose what closing the lid does. Select Do Nothing under Plugged in. Choosing Do nothing for On battery means the laptop will still run even if you disconnect it.