Originally Posted by DTM
Is there a way to place a non-breaking hyphen?
I've tried & #8209 ; and & #x2011 ; but Sigil converts them to a narrow black box. I've also tried alt+2011, but that becomes a wide black box.
Are you sure that Sigil is "converting" them? It sounds more likely that these glyphs are simply not present in the font being used to display the book.