Print a PCB layout several times in the same sheet at once in Proteus
Panelisation (which it what you're trying to do) isn't possible in the printer output. However, Ares does have a panelisation mode, and if you use that to create your multiple copies the printer mode will output them all just fine.

It is a bit of a roundabout way of doing things (intended for manufacture rather than printing, one presumes), but this it how you do it:


Export the design as gerber output.





Use the Gerber viewer mode to view the gerber output. Make sure you tick the panelization mode option.





Use block copy to copy the layout how you want it, then...
Output to the printer as you were doing before.