Additional chat-related features and issues within Microsoft Teams for business
None of these steps worked for myself or anyone in my Org as well. It's really frustrating. Everyone I work with uses teams in a small window so they can use it while working on other things and we all have our monitors mapped out where we like our programs. Forcing something like this and not letting it be an option has me baffled. I even tried switching back to Classic Teams and it's that way there now too.
By far worst update I've seen.