I have a MBA M2 going USB-C -> HDMI on a 4k Dell monitor. You can open and close the laptop and it switches the external from secondary to primary and back almost instantaneously.
I'd describe this as a major improvement over every prior MacOS.
Did this _not_ work on the same M2 laptop while on Monterey?
(I've had this on Monterey from the beginning on M1 MacBook Pro)
Have no idea about ventura, will not update before first patch, I guess.
But the toggle between the modes had been this slow experience that seemed similar in delay to switching resolutions.
Now it is this blip—-this is your main display, and you can toggle it if you rapidly open and close it, which I can’t really recommend except to cement in your mind that this is the new normal.
It seems wholly different.
There's no built-in way to do it.