Make it easier for your signatories to provide information you need to collect by presenting all the fields in a single form, which is particularly convenient for mobile users. Once they complete the form and go to review the document, all fields, checkboxes and other elements will be populated and selected.
To activate this option, when preparing your document go to the Settings tab and under Signing page settings turn on Enable form.
To collect information that doesn’t need to be visible in the signed document, add new fields on the Parties tab, but don’t place them in the document on the Document tab.
See support article for details.