Hi,
Thanks for using the HP Forums.
Can you try the following:
1. Go to Control Panel > View Devices and Printers > Right click on your printer (HP 6835) > Printer Properties
2. Under Installable options > Duplex Unit > Select "Not Installed"
That should turn off the two-sided printing. Remember to turn that on if you want to use 2-sided printing!
Hope that helps!


I am an HP Employee
Although I am speaking for myself and not for HP.
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