Enlarge lyrics, but they don't change size

I’m trying to enlarge lyrics for a piece for people who can’t see very well. I’ve followed directions from the forums to change lyric size (library → paragraph and other lyric options) but nothing happens. What am I missing to actually make them larger?

Using Library > Paragraph Styles to edit the Lyrics paragraph style should absolutely be sufficient. If you’re finding that not to be the case, please attach the project here.