persistent divider line of unknown origin

Hello. I have managed to create a horizontal line in my OfficeMac
document that I can not get rid of. It started out as a centered line
of 10 dashes used as a divider between paragraphs. I pressed return
and ended up with a wavy line that crosses the entire page and which I
can not highlight nor delete. My search of the help section on
dividers has not been helpful. Suggestions?
.

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