Hi Doug,
Thank you for your post. I tried it but am not satisfied. Yes, I could switch a picture to my second screen, by using a shortcut in spectacle where it stays as long as the Mac is running. But after relaunching Affinity pictures appear again on the first screen, so one has to use the shortcut again. Another thing is that the size of the picture on the second screen is never remembered. So the only advantage is that the picture opens on the second screen, if one doesn't relaunch. But if a picture has to be bigger than how it opens in default. for example full screen, one has to zoom it every time. In photoshop both things go automatically once the settings are set. So all in all for me Spectacle only has a small advantage. ( or maybe I'm doing something wrong?)
Kind regards, Roel.