Thanks for your request and votes. We are working on this feature for Word on iPadOS.
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Can’t believe that it is taking this long. I use Pages more and more to open Word documents side by side and edit them. If MS Word for iPadOS takes much longer to implement this feature, I may find myself using Pages as my main word processor most of the time, as it does pretty much what I need and editing is easy. I’m basically doing that now anyway.