@melody495 I currently have the Northwell font set to be for Heading 2 (but want to try different options before I decide for sure). As far as I can tell the Heading 2 content is modified, but to a generic serif font. I believe the change is consistent across my site. Not sure if that answers your question...
Edit: if you go to the "About Me" page on my site, the heading "The Letters" should be a script because it's H2. I also have an unpublished page titled "Font Test" where I'm watching the changes but you may not be able to see that one.