If I wanted a horizontal rule, I'd type a string of em dashes. I can't find easily a way to disable this over-feature in TextEdit prefs ('Text replacement' is unticked) nor System Prefs ('Correct spelling automatically' is unticked). Thanks!
MacOS – How to stop auto-replacement of hyphens with horizontal rule
autocorrectmacostextedit
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Best Answer
In the Edit menu, go to Substitutions, and uncheck Smart Dashes.