Collection name highlighted in yellow

I imported an nbib file. I was editing records to convert to sentence case and to add details to those without an abstract.

I noticed that the collection name was highlighted in yellow. I don't know what I did to cause that, although I think I like it. Later, the yellow highlighting went away. I don't know what I did to turn off the highlight.

Does the highlight have anything to do with the retracted-article alert?
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