How to get there: Go to Settings → Users.
You can require admin approval for all users before they can enter.
Go to Setting > Security and enable User acceptance.
Optionally, you can automatically allow users from a particular domain, for example, your business email domain.



You can see in the user list if the user is approved or not. Also, you can accept the user directly there.

After the admin accepts, the user gets the below email so they know they can enter.
