What exactly does "persona" do?

I thought when I saved/created a "persona", I can use different lyrics and Suno will generate the song in the style and voice of that particular persona. Did I misunderstood what "persona" is? What I have experienced "persona" is that regardless of what lyrics I put in, Suno always generate the same exact song, lyrics, and length of time. Another word, it's the same exact song but the credits are deducted. That's it.