Additional chat-related features and issues within Microsoft Teams for business
Same issue here. There are no diagonal arrows or anything to select.
It started happening this morning. Super annoying and I don't want to delete all the data in the app.
I want to hide the pane outlined in red (names removed for privacy reasons). It used to hide automatically when I selected a team, and you'd just have the chat window on the right side:
P.S. If I shrink the window I can't keep shrinking width-wise, so it doesn't hide the "Teams" pane like it used to.