What version of Finale? Please be a bit more specific exactly what you’re trying to accomplish. Your title is vague.

Finale 27.3  I'm trying to learn how to change from "standard" playback style to "jazz" style and back again

Ok, I’ll presume that you mean from Straight to Swing and back again.

https://makemusic.zendesk.com/hc/en-us/community/posts/4414254039191-Finale-27-Human-Playback-style-changing-during-a-song