How do I get rid of this grey box around my text?

I’m not sure how this happened, but I have a grey box around a certain portion of my text. I don’t believe it’s a border because it’s not affecting the entire page. It doesn’t look like a frame either. Any ideas how to remove it?

Image here:

(edit: activated screenshot)

In LO 5.1.2, one possibility that may have occurred:

Insert / Section

If you click on the text in the boxed area, the status bar at the bottom of LO will indicate the section #. Or could have a name if it was renamed during the set up.

See the picture. Double click on the Section name to bring up the Section Dialog. There is a remove button. In my test, only the section was removed, not the text. As a precaution, make sure you save the file before removing the section.

Perfect! You were exactly right.

Thank you! I had 153 Sections and this cleared all of them!