I have a number of different services in my list, so when I want to block time for everything EXCEPT one particular service/appointment type (say, an introductory phone call), it's exceedingly tedious to scroll through the list and individually select every OTHER service to be UNavailable during that time block. (Particularly when I might do this multiple times a week.) It would be super helpful if it were possible to select ALL and then scroll down to DE-select the service I want to keep as available.