Zoom in on small displays causes signout and recent user chat column to disappear.
Windows 10, Teams application,
On a Dell Latitude 7290 in 1360x768 resolution
If you use the zoom (+) in function past 120% (in my case, at 145%), the recent user chat column vanishes, as well anything south of "Check for updates" disappears in the user menu (when you click on your picture/initials)
This has been reported to me by a client, also on a smaller Dell laptop (no model no, unfortunately) and I was able to reproduce it on mine.