On my machine (Linux 5.8.11-1-MANJARO, powertabeditor-2.0.0-alpha12), I attempted to print a 3 page tab file. It printed as a one-page tab file with very, very small print. I was unable to find any configuration option to alter this layout and ultimately had to resort to printing to a pdf, opening it up in gimp, increasing the print size (possibly unnecessary), cutting it into 3 different layers, reexporting as a pdf, and printing from there.

Prior to that I tried setting a custom layout and increasing the width by 300%, which mostly corrected the size problem but would only result in page 1 being printed. If the height and width weren't both increased by 300%, it had no effect on the print size. The layout looked the same in print preview as well, so it was not simply a printer issue.