What kind of screen size are you on? I've not had issues with the font size, but I'm lucky in that I always work on fairly large screens.
As far as I'm aware, there's currently no font size setting in Studio Pro, but you can change your windows scaling to make everything including the font larger. It's not ideal, but it should do the trick!
I'm on a decent screen size and have not faced font size issue in other editors (Android Studio/VS Code).
Scaling windows font is a temporary suggestion where it scales the font across all the applications
Having control over the font size is a basic need for accessibility and Mendix studio pro should have provided the same. I'm gonna submit an idea post for this.