Word 2016 file displays lines (not borders) between paragraphs in Edit mode only - how to tu it off?

A file created in 2010 and saved to 2016 now displays squiggly lines between every paragraph (see graphic).

The lines display in Edit mode, whether working with a file created in a previous version or with a new 2016 file.

== Update == The lines do not appear in paper layout mode or when printed. Of course, in those modes, you can't do any editing. == End Update ==

I'm running 2010 and do not have the problem; I saw the problem via a video meeting; i.e., the other person was working in 2016 (a university version, mentioned here, in case that is of interest for the solution).

Via a screen share, I stepped through all of the Word Advanced Options to see if anything needed to be checked or unchecked, but saw nothing amiss.

What is going on? How can I advise the other person on how to fix it (make the lines go away)?

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