@Sam424 @Julie1402 , as @Allison2 noted, you have to log into your Google account and go to your calendar.
If your Airbnb calendar is under "My Calendars," you will be able to make it private.
If your Airbnb calendar is under "Other Calendars," you won't be able to make it private if it is already public. If you want to make it private, you can remove the calendar, then import it again from a URL and make sure the "public" setting is not checked.
Google doesn't think you own any calendar that's under "Other Calendars." That's why you can't customize the settings too much.
I spent days on this once, because I wanted to share the calendar with my cleaner. It's hopeless. If you add a calendar to "My Calendars," you can set it for privacy and for sharing with specific people. But the calendar won't update.
I finally signed up with TurnoverBnB, which is free is you use your own cleaners and pay them manually. It's been much better.