Widget signature field cannot be adjusted

I am creating a test widget for a demonstration. I uploaded an existing Acrobat form with interactive form fields that were already in place. The form and the fields all converted correctly in the creation of the widget, but when I attempt to add a signature block on the page the field comes in at a default size that cannot be changed. As a result it covers up the space where other fields need to be. All other fields except the signature can be placed correctly and resized as needed.