[Plugin: NextGEN Gallery] printing the gallery

I’m having trouble figuring out why this gallery displays fine on the page (in three columns), but when printed it forces everything into a single column.

https://www.jenniecamerontextiles.com.au/special-treasures/

This particular page should preferably print out identical to what’s on the screen.
There is no print stylesheet, and I’d rather not have to write one if I can avoid it.

Thanks.

https://www.ads-software.com/extend/plugins/nextgen-gallery/