Custom working time / block timeslots

Hi
I can't find a way to block certain timeslots in a handy way.
For example - how can I block a slot from 9:00 - 10:00 and another from 15:00 - 16:00 on the same day?
There is only ony staff member with several services, and so the slots should be blocked for all services.
Thank you for your help!
Simone

Hello,
you have to turn on the "Prevent registered user from booking more than one timeslot per date", remember this option is only possible when the customer is logged in.
Regards
Benjamin