A family of Microsoft word processing software products for creating web, email, and print documents.
Unfortunately, that is not the problem.
The issue appears to be the fact that I'm using a template that has odd/even pages. I followed someone else's suggestion of a temporary page break before the table in question to position it onto an odd page. That enabled me to adjust the columns. When I removed the page break and the table returned to the even page, the column widths stayed as corrected.
Horrible "solution" but it worked