PROBLEM:
Teams is set in such a way that only when the Teams video is in sharing mode the teacher's picture takes up the whole screen for the other members of the class/meeting. Otherwise, his picture can be seen in a smaller box with other boxes representing all the members attending the lesson.
This is a wonderful tool for meetings or for classes with a small number of students (<10). For classes with many students, such as 80 - 100 this is useless or even misleading.

I warmly suggest adding a menu to simply distinguish if the Teams user is going to perform a meeting (so he/she needs the webcam of each participant) or is going to teach a class. In this last case, I suggest to put in the screen only the following items:
- For the teacher's screen:
a) The main screen (80%) with the teacher image to see/have a feedback on what the students are seeing.
b) The number of students connected (in big format) in real time.
c) A bigger chat vertical bar
- For the students: only the teacher view/ desktop (if shared).
This should reduce the occupied bandwidth resulting in less noise tones and/or jerky movement that are a severe issue for classes with many students.