Very helpful, thanks. I was interested in both scenarios because some apps like XD dont allow you to undock palettes from he application window. Regarding different screen heights, how well does it work with the 14" and 11 iPad in vertical?
You cannot use sidecar in vertical (portrait) orientation on the iPad. There is no option to rotate the iPad display. Holding it vertically does not rotate the sidecar display either.
Either get a bigger iPad (12.9"), or a possible workaround is to reduce the scaled resolution on the Mac so that the vertical resolution matches more closely, but that is less than ideal. I tried this, and the vertical height is closer but still does not exactly match. There is no option to adjust the scaled resolution on the iPad.
Obviously the vertical height mismatch will be different for every Mac/iPad combination.
btw, although the wireless connection between Mac and iPad works pretty well, sometimes it is laggy and occasionally disconnects. This, however, can be solved by interconnecting them with a cable.