Hello Chris,
Thanks for updating in!
If you use the classic text element, all the settings like the font size or font family with this classic text element will be inherited from the global settings which you may have set in Pro > Theme Options > Typography > Body And Content. To have much greater control, we recommend that you use the V2 Text element instead.
The classic custom headline and the headline element can use the different heading tags from h1 to h6 (https://www.w3schools.com/html/html_headings.asp). If you want to make it larger, you will need to set the font sizes bigger. We usually recommend that you use the headline element instead because you can easily set the font family and the font sizes.
By the way, if you are not seeing some extra element settings when editing in Pro Editor, please go to Pro > Settings > Permissions > User Preferences and make sure that the “Advanced Mode” is set to “Always ON”.
Best Regards.