Don't believe so...except maybe to set the print setup page size to something larger than you layout size.
Thank you Josh.
Some years ago I was using FileMaker Pro 4 (I think) on a PC and I was almost sure I could turn off that line in that version of the program. So sure that I have been looking through menus etc and telling myself I am just silly in not seeing the command.
I'm sure you're right about that. Can't find it either.
What you could do is in Page Setup enlarge the print area, so that the line shifts outside your screen. Maybe A3 / 50% / Landscape orientation will do.