Oki C9300dn User Manual page 86

PCL
Access the printer settings page via the [Start] menu.
1.
Highlight the printer name and click on [File] then [Properties].
2.
Click on the [General] tab, [Printing Preferences] button, then
3.
[Setup] tab.
OR
Click on the [Advanced] tab, [Printing Defaults] button, then
[Setup] tab.
Select the required paper size from [Size].
4.
PRINTER DRIVERS > 86