The thread started by marktb1961, [url]https://forum.vassalengine.org/t/user-experiences-with-big-sur/11343/1] “User Experiences with Big Sur” is exactly the kind of stuff I was hoping for.
Seems to be working fine on 27" iMacs. Tentatively the only issue identified was on a smaller screen, and that seems to be resolved by changing a display preference.
Sorry about the clumsy HTML.