If you type Lyric line spacing into the search field, you will see many threads, blog posts and links to the help files on the subject. What to do exactly depends on what you’re trying to do exactly and other aspects of your document. You can customize it about any way you can imagine but there are a large number of variables.

Simon Lloyd,

Take a look at this page from the user manual. Specifically, the sections:

Positioning and Aligning Lyrics

Changing Lyric Fonts

You may find the other sections useful as well

https://usermanuals.finalemusic.com/FinaleMac/Content/Finale/Lyrics.htm