Does Redactor have a button that adds a horizontal rule (<hr> tag)?

Question

Does Redactor have a setting for a button that adds a <hr> tag?

Answer 1

Yes. Edit config/redactor/standard.json file (or the relevant file in your Craft project) and add "line" in the buttons items list.

You should see the "Line" button in the toolbar which will add a hr tag to your contents.