According to this doc: https://help.gohighlevel.com/support/solutions/articles/48001236022-how-to-set-up-a-calendar-for-classes-#Cancellation-and-Rescheduling, currently, when a class booking is made in the CRM, each attendee is registered as a separate event on the Google calendar. For example, a webinar with 3000 attendees will create 3000 appointments in Google Calendar or Outlook.
🛑 Add the toggle “Do not add new events to any calendar" on calendar level, like it's already possible in "My Profile"