The different resolutions appear on the list, but when I select the resolution area for the selection list to come up, all entries on the selection list are grayed out for all monitors. You should know there are 4 monitors connected (all same size/resolution, I think 24”), and all are selectable in the app. 1 & 2 are landscape, and 3 & 4 are portrait. The pinch/expand seems to work first time tried on one monitor, but then after switch to other, it no longer works (popping back to small) on all monitors, including the first one on which it worked before switching.

unfortunately all the other resolutions are grayed out, so can't change!

thank you; now getting that menu and can switch between monitors. If you would, one more question I can't find in help: when I pinch/expand on iPad, image expands, but pops back smaller when I remove fingers; is there a way to keep expanded? Thank you again!