How do I print on both sides of the paper automatically in Windows?
From your software program, select Print and open the print driver via the Properties or Preferences button. Click the Finishing tab, select the 'Print on both sides' check box, and click OK. Then click OK in the Print dialog box to print the job. This requires that the product has an automatic duplexer installed. (Page 32)
From the official HP Laserjet Pro Mfp M226 manual, page 32
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