Most Mac users work with fullscreen apps when they are serious to focus on something. A full screen app gets it's own Space. When using MS With Teams functionality as is, you can only share non-fullscreen windows that are on the first Space (Desktop 1) or share all of Desktop 1. When I work with MS Teams, I have to fiddle with my windows to make it work. Sometimes, I'll have the window shared, but then click to make it full screen which drops it from the share. In either case this cases meeting delays.

Instead I'd like to share any Space (which includes full-screen apps) to reduce the window management I need to do with teams.