Duplex printing by default on Maxify GX4020 printer

[AlanRodgers]

Online support says I can make duplex printing the default by going to settings and selecting the "Eco" option on the touch screen.    There is not such as option on my new GX4020 printer.   I tried to search through all available options.    I cannot find any options to make duplex printing the default.  Maybe not possible.   
Will appreciate input/feedback.
Thank you.

[Hector]

Hello AlanRogers, 

the Eco settings for duplex print will change the duplex setting for copies/reports/faxes. You can view the available eco settings and how to access them using the steps in the link HERE. If you are trying to change default settings for printing, it would be a setting in the printer driver window or in the program you are printing from. For further assistance, you can reply to this post with the version of the Mac or Windows operating system and the program that you are printing from and we can assist further.