If you have multiple salons/employees, you want to keep control of your agenda. It should not be possible that customers can just be removed from your calendar or appointments can be made longer, rebooking is separate from that. There must be a function that can stop you from doing this || It is also not possible to change a certain appointment that is booked as a menu to a different menu. So you first have to delete line by line before being able to choose a new menu, that doesn't work practically, etc...