checked 2-sided print on Print page for HP Printer 9020 but it still won't print both sides
Product: MacBook Pro Laptop
Operating System: macOS 10.14 Mojave
My Printer is HP officejet Pro Printer 9020 series. Its won't find for 6 months now the last 2 weeks it won't print on both sides. I have the 2-sided printing checked on page that you pull up that says print.
I went into the printer settings and I can't find where to check 2-sided printing, I know that I had it before but now I can't find it in settings, or preferences on any page when going into my printers set up pages.