Just to know what you have tried:exchanged long/short edge binding (printer)checked reverse page orientation (printer)changed orientation to auto.
What does it mean to print on long edge. It all depends on the grain of the paper. The edge refers to where the next page follows on from with your print remaining upright. When duplex printing, you can choose which way you would like your print to appear on each side of the paper using the short edge and long edge features.
In order to get to 2 sided printing, i go to the blue printer button on the bottom left. I’m assuming you’re referring to printing presses, and not desktop printers. It’s always advisable to select paper with a long grain.
And this is the dialog box that comes up after i. Short edge means the pages are bound along the short edge of the page.