Hi, you can get rid of the line breaks on Readlng’s Edit page. Under the main text editing box there’s a tick/check box - “Ignore single new lines” - tick/check this, Save, and the line breaks should disappear. I’ve just uploaded The Three Musketeers, French edition, as an epub from Project Gutenberg, which was full of line breaks. Once I ticked the box, they magically disappeared (after a few seconds) ( Readlang )
It’s also good for YouTube transcripts. Funnily enough, just before reading your comment I had just uploaded a comment about this. (Avoiding line breaks)