Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 172)

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You see the expanded printer settings window for your product:
Note: The print window may look different, depending on the Mac OS version and the application
you are using.
5. Select the Two-Sided , Copies , and Pages settings as necessary.
Note: If you do not see these settings in the print window, check for them in your application before
printing.