Having an external monitor connected prevents my Mac from sleeping when I close the lid. Is there any way to opt out this feature?

marked as duplicate by user151019, Tetsujin, Allan, user3439894, nohillside Jun 27 '16 at 15:06

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You can simply click on the Apple in your menu bar then click Sleep while leaving it open. This will make both monitors go black. You can close the lid afterwards if you like. Opening the lid or pressing keys on keyboard will awake the device from sleep.

It's just made to go to another monitor when closing the lid as most people only use the external monitor instead of 2 monitors.

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