HP LaserJet Pro MFP M127fw - Manual (Page 29)

3. Click or tap the Layout tab.
4. Select the appropriate duplex option from the
Print on Both Sides Manually drop-down list,
and then click or tap the OK button.
5. In the Print dialog box, click or tap the OK button
to print the job. The product will print the first
side of all the pages in the document first.
ENWW Print tasks (Windows) 21