Printing in Landscape with AirPrint

Dear all,

I am trying to print a Word document (Word for Mac 16.42) to a Canon i-sensys MF635cx using AirPrint from an iMac (macOS Big Sur 11.0.1). When I go to print it, this is what I see in the print preview and it's also what I get when I print:

This is infuriating. Printing documents from Word has been going on for a few years now; why does the iMac not allow me to print a document properly? Is it somehow new to Apple or are they simply incompetent?

I'd be very grateful for a solution. Apple already replied, sending me to webpages with an explanation of how to use Word for Mac - that wasn't any use. The pages were about how to set pages in a document to portrait or landscape; I already know how to do that! It did not solve this printing issue

Thanks in advance,

sd