As others have run into to their frustration, Word will automatically change the page orientation based on the width vs. height. This can be very frustrating when it conflicts with printing forms/labels that don’t conform to that pattern.
Changing the section.PageSetup.Orientation doesn’t seem to have any effect on this. If Aspose were able to override this as an option, that would be very helpful. For instance actually force a document that was wider than taller to profile.
In my current case, I had to create a new template that used a taller than needed page size, and forced all the content to the bottom of the page within a wrapping table.