How to remove automatically added Signature/Email tags

I have successfully uploaded a pdf document then created an agreement using the POST /agreements endpoint.

At this point I want to add a custom signature form field to the agreement which I do successfully using the PUT /agreements/{agreementId}/formFields and passing up the location area where is signature box is meant to be, this also works succesfully and can be seen via the receivers Adobe Sign account.

The form has a 2nd 'Email:' and 'Signature:' fields placed at the bottom of the pdf that the receiver can click to add their signature. How do I prevent both of these from being added? The signature form fields I am adding via the PUT request is all I want.

Thanks.