If you would like to not notify patron when create booking by iPad, you may set it by iPad:
You need to turn on this option by following steps:
inline App > Settings > System Settings > enable Show manual patron notification optionsWhile create the bookings, you may manually control notify customer or not.
orange button means enable, grey button means disable, and if you disable it, the system will not send out the notification to the customer when booking create, reminder, or cancel