If you are presenting over zoom, you ideally want to put your full screen presentation on one screen (which is shared), and put the zoom screen on the other. So you know who is talking. Maybe look at chat.
Keynote, on a dual monitor setup, will takeover both screens, and will not allow something like the above. No options to disable dual screen usage. 5 years post-pandemic, after millions of presentations given over zoom, probably thousands given by Apple's own engineers, this is still not fixed.
Even if I make a presentation in keynote, I export to PDF.
And if monitor space is a premium or you don't have a second one you can use something like Deskpad (https://github.com/Stengo/DeskPad) to create a virtual one a window. This is also practical if you want to have the speaker view up.
Keynote, on a dual monitor setup, will takeover both screens, and will not allow something like the above. No options to disable dual screen usage. 5 years post-pandemic, after millions of presentations given over zoom, probably thousands given by Apple's own engineers, this is still not fixed.
Even if I make a presentation in keynote, I export to PDF.