So this little ridiculous issue has been haunting me for two days until I finally got a moment to troubleshoot it.
My Word page zoom has been stuck at 70%-something the last few days, even though I had plenty of white space (or gray space) on both sides of the document.
Turns out the page view layout was setup to use “Page-to-page” instead of “Vertical”.

Change layout to “Vertical” and the issue is resolved!

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