Edit Overlays
When you create a Print Template, it is treated as a separate SWD. You can edit or save this SWD just like any other file.
Edit Overlays modifies the Map Frame overlays.
Select Paper > Map Frame > Edit Overlays.
This opens the Overlays window. Simply make your changes and click OK when done.
Remember any changes you make in your original SWD are not automatically inherited in the Print Template SWD. To update these changes Refill the Map frame.