Mariano explains that the SOP Quick Print feature does not work when window ribbons are enabled. This goes back to a rash of issues that can be fixed, at least temporarily, by disabling the ribbon interface.
The Dynamics GP Blogster: SOP Quick Print feature does not work when window ribbons are enabled
Sales, Purchasing & InventoryTips & Hidden FeaturesMicrosoft & the GP Ecosystem
Archived post from 2015. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.