This is also being discussed in the old Word newsgroups. Basically, Word always depends on the printer driver when it lays out documents, and different operating systems make use of different drivers. Creating a PDF would be the easiest approach.

For more, also take a look at http://word.mvps.org/faqs/formatting/textreflow.htm.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional