Using Viewer API to increase font size?

What’s the parameter to use to increase / alter the font size of the annotations? I can see in the examples I can alter the circle and numbers, but I need to adjust the actual size of the font within the annotation itself.

I don’t think that’s possible. Apart from the circles/numbers the annotations system is a bit of a black box. You can’t change their appearance. However, you can build your own annotations by setting up your own animation loop and using this API method: Viewer API - Functions - Sketchfab
You can even do raycasting to check whether an annotation is visible or not: Viewer API - Functions - Sketchfab Though that gets heavy very quickly.
You can see an example of a custom annotation I’ve built recently here: CVL002 Gore

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