Displaying your screen content to others during a Teams meeting or call for collaboration
Same issue on our devices, Latitude 7x50 and 5550 running Windows 10.
The issue appears within Teams (Video calls, Screen sharing) and in other Apps like Edge when playing videos.
The latest Graphics Drivers from Intel have been installed (clean install).
Issue appears both docked and undocked.
The same issue was raised in thid DELL Forum.
Link