My M4 MacBook Pro shuts down while I'm presenting

This should be easy to fix. Just change the settings in System Settings->Lock Screen to give it a longer time before the screen turns off.

I am not at my mac just now but later I can post a screenshot if you need it - but you can probably find it already.

lloydml wrote:

Thanks Luis I’ll give that a try as a temporary fix. I’m still wondering if there’s something that might override it when I’m presenting. It seemed to do that in the past.

If that possibility exists, I assume it is the responsibility of the application you are using to present - I mean, there are a huge number of things you can be doing with multiple displays, I don't think there is a way the OS can "know" that you are presenting; but an application like, for example, Keynote, might have a setting that would prevent the screen from sleeping.

EDIT: I just did a quick test, setting the screen to turn off after 1 minute. Having a Keynote presentation running prevented the screen from turning off. This seems to happen automatically, as I did not find any Keynote setting for it.

Change this to a long time, or if you prefer, choose "never"; likewise for the other two settings.