By default, the Google calendar that is connected with the Google account you used to sign up CozyCal will be the calendar to which events are added.
However, you can share and add other Google calendars as "Busy time calendars". In this way, any availability that overlaps with busy events in these calendars will not be shown to your guests.
👉You can learn more about sharing Google calendars in this post:
Share your Google calendar with others
If you have signed up with your email account instead of Google account, you can choose to connect with a Google calendar within CozyCal.