It may happen that you perform treatments that are not allowed to be booked online, but you still want to show them. A possible solution here would be that the option to "book online" for that service is activated, but the knowledge for all employees is deactivated.

And you can add a description to that specific service. The description could be like "This service is only bookable via phone", mentioning your phone number.

To add a description to a specific service, go to Settings > Services > Click on a category and edit the specific service.

These are often treatments that require a consultation or consultation, such as the placement of extensions. Promoting your business and services in this way is good, because at least customers see what you offer, without having the option to make an appointment for this treatment via online booking.