Additional features, settings, or issues not covered by specific Microsoft Teams categories
I've installed the latest Teams too but it's not fixed for me! If I use any resolution above 3000 x .. sharing the entire screen doesn't work.
I can use the same hotfix for sharing the screen as Alex ACK does, using a lower resolution. But this should not be a solution of course.
I'm using a widescreen monitor and for the connection from my laptop to monitor a USB-C cable.