As a developer, I can tell you all that this is driving me insane. I can find no way to enable rotational support programatically. I've tried even sending a "rotation event received" event to my apps and can't get the app to rotate into landscape mode when running on my silicon macs. I have been monitoring this problem for years now and still am shocked that Apple hasn't provided a simple "rotate" menu option.
Let's also not confuse "tilt" with "rotate". A rotate event changes the user interface's "device orientation". Tilt events are very different. The "Touch Alternatives" screen that as of Ventura 13.5.2 show no options for rotation and there are, as far as I can tell, no way to run an iOS app in any orientation other than portrait.
It might be possible to change my app to specify "only allow landscape orientation", but I believe I already tried that and that didn't work.
Apple, please give us a definitive response to "How to run iOS apps in landscape orientation on our silicon equipped Macs."
Lastly, I have to ask: When the vast majority of Mac screens are landscape orientation, who's bright idea was it to run them in portrait? Aaarg.