Some fields on the forms have the ability to "Hide" the field allowing information to be captured behind the scenes based on a users submissions. We have used this to help apply dynamic labels, dynamic users, custom field data, etc.
Currently, the only way we have been able to "hide" these other fields is to set the layout to 1px width. It would be nice if we could just check a box to hide the information that is being captured from the requestor making a better user experience.