When I share screen during Teams meetings, I can only share Screen option not the Window. If I select window ( it doesn't show multiple opened tabs, so I can't choose what I want to share) it only shares my Teams window which is gallery of my attendees, not other tabs that are opened on my iMac. Until June 2021, this was not a problem. I could choose windows to share. and work on other documents while screen was being shared. now what I see on my computer they see it too.
p.s. this is a new Teams meeting than last year because I am teaching a different group of students this year.
