Tips to control your Zoom meetings¹
Don't make meetings or classes public. You can require participants to use a password, or the meeting manager can make participants first appear in the waiting room and be admitted individually.
Invite with care. Do not share links to your meeting on social media. Email or text them directly to participants.
Limit screen sharing. Hosts can prevent others from posting video by changing the screen sharing options to “Host Only.”
Lock the door. You can close your meeting to newcomers once everyone has arrived. Hosts can click the Participants tab at the bottom of the Zoom window to get a pop-up menu, then choose the Lock Meeting option.
Use your silencer features. You can disable video for participants and mute an individual or all attendees.
Cut out the chatter. The host can disable the ability to text chat during the session to prevent the delivery of unwanted messages.
Boot the uninvited. Hosts can remove a participant by putting the mouse over that name and choosing the Remove option. Allen says you can block people from rejoining meetings if they were removed.
Preparation. Make sure participants have the latest version of Zoom's software, which was updated in January. That update added meeting passwords by default and disabled a feature allowing users to randomly scan for meetings to join.
¹ Snider, Mike. “Zoom Issues: People Hijacking Streams, Possible Security Flaws.” USA Today, April 1, 2020. https://www.usatoday.com/story/tech/2020/04/01/zoom-demand-zooms-but-problems-coronavirus-drives-stay-home-video-chats-zoom-has-issues-beyond-deman/5102150002/.