If a practitioner needs to do a double booking at the same time there is a pop-up that appears to inform about this Double Booking. This is to help the practitioner understand if they will still book at the same time or not if the service has a double or more bookings option. This one is only available when you do a manual booking, if a client books the service online, this double booking feature is not available.

A practitioner can do multiple bookings (For the same practitioners and different services) in the same time slot.