Make a Service Unavailable for Online Booking
To make a service unavailable for online booking, perform the following steps:
1. Click on Settings
2. Click on Employees & Services
3. Select the desired employee
4. Click on Services
5. Select the desired service 
6. Scroll down and check Yes for the option I want to control which clients can select this service
7. Select No client can choose this service himself in the drop-down menu
8. Click on Save at the bottom or at the top of the page
