No - I am talking about print preview that is a setting in the printer driver itself. This is a standard tick box certainly in Epson drivers, and I think Canon as well. You get the preview on screen after it has been sent by Qimage to the driver. The preview shows you exactly what will print and you can then enlarge that and click Print or Cancel.
Ah, I see. In this case since I'm doing print-to-file for output to a Fuji Frontier device, I don't think I have access to that kind of preview.
I'm pursuing it from an enlarge-the-screen-with-software angle now — trying to find out which third-party tool for screen magnification might work best. Windows' own screen-magnifier tool does work but it's crude-ish and clumsy. (What? Something crude 'n' clumsy from Microsoft? Perish the thought.) One of the other freeware or shareware offerings out there will no doubt be better.