There are some options available when you first start your meeting or when you schedule a meeting that can help prevent in-meeting disruptions. This article focuses on how to lock a meeting after the expected participants join. Go to Resolving Unexpected Behavior In Meetings for additional tips.
To avoid letting in uninvited participants in the first place, share meeting URLs only with intended participants.
As an extra security measure, you can lock your Zoom meeting so no one can join after a certain point.
Join the meeting and wait for all participants to join.
Click Security in the bottom toolbar.
Select Lock Meeting. This will automatically turn away anyone attempting to join the meeting.