Add Event Custom Fields

So I found the way to create custom fields here:
https://wp-events-plugin.com/documentation/event-attributes/

But this is just showing me how to create dropdown menus. I’d like people to be able to choose multiple checkboxes for the topics.

If you click this link: https://www.pcutopia.com/rc/search and then click “Topic” you will see what I mean.

How can I create custom field checkboxes?

Thanks!

you need to modify template file at events-manager/templates/forms/events/attributes-public.php

to use templates: https://wp-events-plugin.com/documentation/using-template-files/