If you add additional buttons to your form, one problem you might experience is all the buttons options will appear at the top of your form in the ribbon.
Hiding buttons from the Form Ribbon
Luckily Nintex has made hiding button options from the form ribbon really easy.
1. Double-click on the Button you want to hide from the Ribbon
2. In the Control Settings for the Button, expand the Ribbon section, change the Show on Ribbon dropdown to No. Save the Control Settings.
Finished Example: The Submit and Close buttons have been hidden from the form ribbon.