Kyocera FS-1020D Operation Manual page 31

2
The Menu dialog box appears. Select and double click Page control,
then click Duplexer.
3
Press the button next to the pull-down menu on the right side of
the screen, and select Long edge, short edge or OFF.
4
After you have selected the setting for the duplex printing mode,
click the OK button to return to the start-up screen. The setting for
the duplex printing mode is changed.
1-21
Page control
Duplexer
Duplex printing mode
Paper