Go to Settings → Online booking → Booking rules and set your Cancellation window. It defines how far in advance a client must cancel.
At 24 hours, a class on Thursday at 18:00 can be cancelled until 18:00 on Wednesday. Once that point passes, clients can no longer cancel their own booking and only you can remove them.
The same screen holds the other rules that shape booking — lead time, booking horizon and appointment segments. See Setting when clients can book.
How clients cancel
Signed-in clients cancel their own bookings from their upcoming bookings list in Bobclass Go — in the app or on your web booking page — as long as the cancellation window allows it.
Clients who booked as a guest, with only an email address, cannot cancel for themselves. They will need to contact you.
What you are notified about
An ordinary cancellation does not send you a push notification. It is recorded in the Timeline in your Inbox along with all other client activity, so you can always see it — it just does not interrupt your day.
The exception is a cancellation that frees a spot in a full class with clients on the waitlist. That does send a push notification and creates an Inbox entry, so you can promote someone in time.
How owners cancel a client
To remove a specific client from a session without cancelling the whole session, go to the client's profile, tap Upcoming bookings, and cancel the relevant booking from there. You can also do it from the event details. This works whether or not the cancellation window has closed.
Class Pack credits
A cancelled booking never costs a client a credit, whichever way you have Bobclass set up.
By default, credits come off at checkout , after the session. A booking that was cancelled never reached checkout, so nothing was taken.
If you use Require product to book , the credit is taken when the client books. Cancelling the booking undoes that checkout and returns the credit.