How do I print single sided on a Mac or turn off double-sided printing.

For those who may be still having this problem, here's what worked for me.  When the print dialogue box appears, there is a box at the bottom called "Printer" (it is to the right of "Page Setup").  When I click on it, there is a dialogue box that asks you if you want to continue, so hit yes.  Then a smaller box opens that has print options specific to my printer.  There you will see a box to select two-sided printing.  Make sure it is not checked.  At least that worked for me.

I have the default for two-sided printing set to "Off" on a MacBook Pro 16" running Catalina 10.15.6.  However, whenever I print, the default shown is two-sided.  Printer is an HP8600 all-in-one and I have downloaded the current driver (June 2020 update).  Apple Support could not resolve the problem and said I'd have to talk with HP, which I haven't done yet.  Any suggestions?  It is very frustrating - I do only legal documents and they are never printed two-sided.

I found a website that helps fix this issue. It requires you to access the terminal. https://www.howtogeek.com/309677/how-to-stop-two-side-printing-from-being-the-default-in-macos/

this solution involves skills that most end users don't have.  completely unhelpful.

I followed the steps on the Help Page that Tariq Dar gave. It all went smoothly until cups.org asked for a UN & PW in order to save the changes. I went to the home page and searched around on cups.org and didn't see where I could login and get a UN & PW. What am I missing?

I All, I have been struggling with this for a while. I had to Uninstall Printer and UPDATE THE PRINTER DRIVER FROM SCRATCH of the brand ( mine was SHARP) and that fixed it. I had to contact the Printer Company to get the setting right but that worked. I hope that helps

This suggestion worked for me. In Acrobat Reader, go to "Preferences" (Apple menu), then "document," and change "View documents in PDF/A mode" to "Never." Then quit Reader and restart.

If you are using a Mac, open your PDF in the Preview application. It will show the options to print single or double sided.

Click search icon. Search for preview app.

Open your pdf and choose Print from the File menu.

After updating the firmware of my Brother MFC-9340CDW printer, now when I select Printer from the first print dialog box, then select Yes in the Acrobat Reader pop-up, the final print pop-up has a box for two-sided that can be selected or not.  Deselecting it has allowed single-sided printing of a multi-page document.