This asks in this item are on on the backlog. In the meantime, hopefully this article will help so you can adjust your view to your liking:
Thanks.D Knight supported this idea ·
An error occurred while saving the commentD Knight commented
This needs fixing. Since nearly all cameras are 16:9 and not 4:3 why should the videos be cropped to 4:3 it looks awful. You have to make the Microsoft Teams app only use 1/2 the desktop to force the video to display right.