You could select the "Microsoft Word 2007" option in the "Lay out document as if created in" box in File tab | Options | Advanced.

Another thing you could do (but I realize it would be more difficult) is install the driver for the printer that your client is using; you should then be able to see how the client sees the document. (Note that you wouldn't need to get the client's actual printer, just the driver.)

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional