Horizontal lines - engrave mode

Hi! I can’t deal with one thing. How can I add horizontal lines in engrave mode? As are here in the table of contents How to Use Flow and Player Frame Filters to Create an Index Page | Page Layout in Dorico - YouTube
Thanks!

I suspect those were created by inserting a text frame, but not making it very tall (i.e. putting the top and bottom edges of the text frame at the same height) and adding a border to it.

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Thanks! :+1:t2: