In Portrait mode, the back is right side up.
Note, page number 2 (back) is upside in Landscape mode.
Note, page number 2 (back) is upside in Portrait mode.
In Landscape mode, the back is right side up.
The following should be selected for double sided printouts.
Check box: Print on both sides of paper.
Select Flip on Long edge or Flip on Short edge.
This option depends on the Orientation of the print.