How do I prevent my MacBook Pro from sleeping when I close the lid?

closing the lid of the display is a request for the Mac to go to sleep. if you want to use it in closed display mode, you MAY be able to, provided you meet all the conditions:

connect the external display.

connect a stable external power source, this does NOT work on battery alone.

connect an external keyboard and pointing device.

THEN try closing the lid

Closing the lid is a requirement to use a second external display on a M3 MacBook Pro, with the base M3 chip, running Sonoma 14.6 (??) or later.

That implies that there must be a way to close the lid without putting the laptop “permanently” to sleep.

Al_P18 Said:

"How do I prevent my MacBook Pro from sleeping when I close the lid?"

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Use this Terminal Command:

sudo pmset -a disablesleep 1