iMac won’t allow me to print double sided
I have an Epson xp8500 printer and my iMac won’t allow me to highlight and print double sided yet I can print airless double sided from my iPad On this printer. I’ve tried every way to make double sided work On my Mac but I can’t figure out how to do it. Please could someone advise me,
thank you
iMac 21.5″, macOS 10.14