Maybe this will assist some with the task of changing line breaks to section breaks when preparing an e-book MS to transfer for preperation to a print book, maybe not?
Hopefully it will be of use.
If the wording on the screen passes too fast pause to read. It might be better click in the YouTube icon on the screen to watch it there. To see that put your cursor over the video. Or use this link.
Let me know if it helps.