From your All Customers > Participants > Trials you can add custom fields like:
Restrictions and Allergies
Virtual or In-Person
To do this, click Settings in your All Customers Section
Next, select "Add new field" & input your new custom field and click save.
It's that easy! Once saved, view, edit, or delete your custom fields at any time.
You can view the custom field entries on each participant profile from the Control Panel > All Customers > Participants > All.