An event registration page has been set up on our web site (WP Event 1 image). This was created using an Event Template in Theme Builder.  As you can see the form fields are optional. I want to make these Required fields. 

In the Registration Form back end in setting up the form fields the field validation and rules have been set to Required (WP Event 2 image).

When the Save Changes button is clicked the fields revert back and clear the validation rules not allowing the changes to be saved.

Can anyone assist me in solving this problem.