Good morning Brett
Despite Junes faith in my knowledge of Macs sadly I don’t think I can add anything helpful here as I don’t have a second monitor at the moment to test AR with.
But some thoughts…
Dose which UI mode AR is using affect anything i.e. Docking or Classic modes?
Or possibly whether AR is in Fullscreen mode or not?
AR on Macs effectively has two Fullscreen modes.
One triggered by using the double arrow in the top right corner of the app’s UI, the other by using the standard Mac Green traffic-light window button top left.
With the former method AR can be hidden using the standard Mac key command; cmd+H. But not if the Green button was used to enter Fullscreen.
Given this anomaly exists, I wonder if AR's given UI sate may also have a bearing on how you move AR to another screen…?