I'm surprised we don't have this captured in a Knowledge Base article yet. I'll see if I can at least get that process going.
@CGBenner - It would certainly be easier for users to be able to make these annotation style changes directly from the Model Styles Editor, but (unfortunately) it's a fair amount of development work to make that possible. We discuss this enhancement almost quarterly, and is a problem we're anxious to solve without question.
Please apply pressure here with the formal process of submitting and voting for this on the Inventor Idea Station.
This request embodies what we're looking to do, it only has 5 votes right now:
https://forums.autodesk.com/t5/inventor-ideas/change-3d-annotation-style/idi-p/10812579
...6 now, I just added mine.
-Andrew Faix
Principal Experience Designer
Autodesk, INC