Cancel
Settings → Billing, then the ⋯ menu on the plan card → Cancel plan (Cancel trial during a trial). You are shown your end date before you confirm.
Until that date
Everything keeps working, and Keep my plan on the plan card stops the cancellation. Cancelling during a trial means you are never charged.
After that date
Your booking page stops taking new bookings and your account becomes limited. Your data is kept, so resubscribing restores access.
Cancelling is not deleting
Cancelling stops payment. Deleting your account is separate: Settings → Advanced → Delete account schedules deletion for 30 days, and the owner can restore the account until that period ends.
Before you go
Export anything you need, and tell customers who already have appointments booked.