Navigate to your meeting in the Teams calendar and click on an occurrence and select Meeting Options.
Change the two marked settings to "Only me"
- Having students put into the lobby and waiting for the teacher to admit them prevents students from getting into the meetings without the supervision of the teacher.
- Having students be participants an only you be the presenter keeps you in charge of the meeting.
You can still go to the participant's list to allow a student to be a presenter when needed.
Ending the Meeting.
It is also important that you don't just "Leave" the meeting at the when you are done, but that you "End Meeting." If you leave the meeting and there are still students in the meeting, then they will remain in the meeting, unsupervised, with whoever else is also left.
To end the meeting, click the down arrow beside the Leave button and select End Meeting. This will remove all the participants and end the meeting as you leave. Students will not be able to re-join the meeting without your permission.