Only Superusers and Intermediate/Full Access Class Admins can do this.

You can make the call to action registration buttons for classes visible to all, logged in users, or only admins on the class registration page.

  1. In the side menu click Classes > Class Admin.
  2. Click by the desired class.
  3. Click the Registration Visibility dropdown and select the desired visibility.
  4. When finished, click Save.

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See Also
How to Hide Classes on Registration Page