Apply categories to the events on your form

To apply categories to events go to the Module content page and click on the tab Registration types, see image below. 

Select the event you want to add to a category and click on the 3 dots above the table.

In the new screen that opens, you have to select the category or categories the registration type belongs to.
Note: When a participant does not have a category, all events will be visible to this participant.

In the tabel you can see at the Categories column if an event is connected to a category.

You can also edit an event and select the category in the edit screen.