Step 1: Click on Settings in the dashboard and then Login options. SSO can be enabled/disabled for the event.
Step 2: Connect SSO if not previously done. Once connected, default SSO will be enabled for all events and other login options will get disabled. The configuration of the login methods can be changed as per requirement.
Step 3: For closed event Restrict Access toggle can be switched on, it will then allow only the people added under the People's section to access the event.