Resources will be reserved automatically when creating an appointment only if they are attached to services.
Go to Settings - Services, click on the folder with the category name. A new window will open, click on the name of the service which you want to attach the resource to.
1. On the Resources tab, click the Add Resource button.
2. Select the required resource from the list and click the Save button.
3. You can attach several resources to the service. To do this, click Add resource each time.
4. In order to detach the resource from the service, click the Delete (a basket icon), and then Save.
At the same time, when a client independently creates an appointment online for a service which some resources are attached to, by default, one free copy of each resource is reserved.