While in Microsoft Teams, you can click on: More/Settings/Call Health.

This Call Health panel has been designed to make it easier to analyze issues that you can have with the audio/video/content sharing/network quality by providing a list of parameters, such as round-trip time, packet loss, frame rate, and CODECs. You can see that Microsoft Teams will change the resolution depending of the quality of the network and if you’re screen sharing or not.