This article will show you how to remove fields from the Enrolment Form
Navigate to the Form Editor
On the form click on the field you wish to remove
In the panel on the right, click the delete icon
Choose the delete option
Delete field from form only - this will delete the field from the form, but it will remain on the pass design.
Delete field from form and design - This will remove the field from the enrolment form and the design (if present).