When you tick this option (the default), the "group" and "option" type fields are printed with the box around them. This is useful for printing plain windows (where there are no background images).
If you don't tick this option, only the caption of the "group" or "option" type fields are printed. This may be useful for printing "Form" type windows where there is a background image as a form.
Since this is a global setup, all your windows will take this option unless overrode locally.
See the example Groups with Tabs.