This documentation page is for Quform version 1 and may not be applicable for Quform 2 click here to visit the documentation for Quform 2.
This option is enabled automatically when you add a form in a popup to a post / page or when you add a Quform Popup widget. If this does not happen for some reason you can tick this option to manually enable the Fancybox script. If you have disabled Fancybox output in the above settings the script output will still be disabled.