@Peggy88 Try going to your "account settings" then click "settings" you might have the screen below with a bit of luck, then you can switch on professional hosting tools.
OH MY GOODNESS!!! Thank you for this information!! I've been suffering for months and even had to cancel a guest because the stupid app didn't block off dates it was supposed to (since i've been missing the multicalendar option) and now I can use it again!!! THANK YOU THANK YOU THANK YOU!!!!!!