I am sper Reports PDF labels on an Argox OS-214 printer, but printing on Chrome and other browsers always goes sideways, I've tried several solutions but none worked
Check the PrintOrder in your jrxml... the former designer "iReport" always made it to horizontal, when the width was larger than the height. Some printers decide on the orientation how to rotate the output.
You can change it in the jrxml directly (not via designer) to "vertical" and try if the printer is rotating it 90°
Not sure whether the new JasperSoftStudio does such nonsense, but just give it a try
hth + regards