Usually it's Fn + F8. Check on the keyboard, there should be one of the function keys labeled "CRT/LCD" or with a barreled square (meaning a monitor's shape) on it.
You may need to install the Dell QuickSet utility to control hotkeys.
Hello and Welcome to FixYa!
If I'm not wrong, its the F8 key OR Fn+F8 Try both, one of them will work. IF your problem was solved kindly do Rate! Regards, Waqar.
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