A margin that is 1/2" or 5/8" instead of 1/4" or 3/8" should not make too much difference in how the printed page looks.

Before making any changes, use Save As on the File drop down menu to create a new specification similar to the old one.

On the one that you change, be sure to go to Specification Options on the File drop down menu and change the title of the modified report so you know which was changed.

Of course, you can keep both and choose which to use when printing, or assign a specification to the user at each desk.