You can view your services and their categories in Administration > Services. In Administration > Booking views you can see service categories per booking view. You can create new booking view by selecting the plus icon. You select the service categories for a certain booking view by editing the view with a pen icon. One service category can only be in one booking view. If service category is not linked to a booking view, the category and this way all the services won't be visible to your customers. It is not recommended to create more than 4 booking views.