Beginning with OS 13. (The problem still exists with 13.2.1) Double sided printing is locked to on. I cannot shut it off. The control for this function is dimmed/gray. Did not have this problem with OS 12. I'm running a 2019 Mac Pro, the printer is an HP M404dw.
Hey there Ziatron,
Thanks for visiting the Apple Support Communities.
To help isolate the printing issue, we would like to see if it continues in safe mode. Booting to safe mode will do a few things to help us on this path. First, during boot, safe mode runs a check on your startup disk, and makes repairs where it can. Then, once booted, safe mode disables certain software and processes that might be causing a conflict. To learn more about using safe mode, how to boot to it, and what to do with your findings, please see the steps in How to use safe mode on your Mac - Apple Support.
if the issue continues in safe mode, try a new user account: Add a user or group on Mac - Apple Support. This will help us determine if something specific to your user account is causing an issue.
Don't hesitate to respond back if you still need help.
Cheers!
There’s a printer firmware update from December for that HP printer. Try that.
Double sided printing is LOCKED to on
