Yeah, “full-screen” or smaller, until yesterday I simply could not get any Affinity app to work at all when using Stage Manager to extend my screen/display to my Dell Ultra Sharp. They would run ok when I had my Dell set to mirror my iPad display. I just did try to set Designer to full screen on my Dell, and that did not work, but right how I have Designer taking up most of my external display and overlapping another app. And I have another app running on my iPad display, and they all are working fine. Since they were not working at all, I have updated all my Affinity apps and my iPad OS to the latest versions. I suppose it could have been Divine intervention instead, but I would guess He/She has bigger fish to fry.