Epson WorkForce Pro WF-C8690 A3 Color MFP with PCL/PostScript - Manual (Page 169)

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2. Select the type of document you are printing as the Document Type setting. The software
automatically sets the Adjustments options for that document type.
3. If necessary, customize the Adjustments settings as instructed on the screen.
4. Print a test copy of your double-sided document to test the selected settings.
5. Follow any instructions displayed on the screen during printing.
Double-sided Printing Options and Adjustments - Mac
Parent topic: Printing with the Epson Standard Printer Software - Mac
Related references
Double-sided Printing Paper Types
Double-sided Printing Options and Adjustments - Mac
You can select any of the available options in the Two-sided Printing Settings pop-up menu to set up
your double-sided print job.