hello, on my macbook air 2020, the shutdown function is missing at a certain time, how can I restore it?

Maximiurku wrote:

I just lost the function when you can program the laptop to turn off at a certain time

Apple removed that feature from Settings. You can still set it up through Terminal, however,

Schedule your Mac to turn on or off in Terminal - Apple Support

It’s time for a force restart then, Press and hold down the Command (⌘) and Control (Ctrl) keys along with the power button until your screen goes black and your Mac restarts.

Is the shut down not there in the Apple Menu? If so you can force a shutdown, by pressing and holding the power button until your Mac shuts down.

Shut down or restart your Mac - Apple Support