Start or Join a Chalk Session > Waiting Room
  
Waiting Room
* 
The ability to enable the Waiting Room is only available if you’re using Standard Encryption.
As a host, you can enable the Waiting Room during your active session that will allow you to control who can join your active session.
Once enabled, you will be notified when a new participant enters the Waiting Room. You can then select whether or not the new participant can join the session.