Shrink all elements?

[Christopher Meredith]

I've searched, I swear. If there's a really simple answer, I apologize
in advance!

I'm looking for a way to simply shrink everything to make it easier to
fit on a page. My first lines of defense are usually shrinking the
distance between staves, decreasing the minimum distance between
lyrics, and increasing the margins. But it occurs to me that the music
would still be perfectly readable if it were all smaller. In Finale,
there was a percentage tool that you could use to just scale
everything to, say, 90%. Is there a lilypond equivalent?

Thanks!