This menu is intimately related to the “Page Size” and the “Scaling” settings. If Paper Orientation is set to Default, the setting will have no effect on the defined Page Size. However, if it is set to Landscape, this will force the defined page size to be Landscape. For instance, if the Page Size is set to ISO A4 and Orientation is Landscape the page size will be internally stored as width=297mm and height=210mm.
Note that the Orientation setting can also take effect when a Custom Page Size is defined. If the defined custom page size is 8 x10 inches and Orientation is set to Portrait, it will have no effect, because the defined page size is already a Portrait one. However, if Orientation is set to Landscape, then the page size will be 10 x 8 inches, though the custom width and height fields will not automatically change to reflect this.
Orientation does also apply to the “Scale to” option in the “Scaling” menu. So, if “Scale to” = “ISO A3” and “Orientation” = ”Landscape” the job will be scaled to an ISO A3 Landscape.
As a reminder, Paper Orientation applies both to page size and scaling. However, if page size is set to “Default”, then Orientation has no control on the source page size orientation and does only affect to scaling.