Epson B 510DN - Manual (Page 88)

5. Select the appropriate Size setting.
6. Select Portrait (tall) or Landscape (wide) to change the orientation of your printout.
7. Click the Page Layout tab, select Manual from 2-sided printing, then select the Folded Booklet
check box.
B-310N/B-510DN User’s Guide
Printing with Special Layout Options 88