I did not find how to change the design, buttons, fonts, etc.
The only available options are those you see in the right sidebar in the Editor when adding and selecting a specific WooCommerce Block. In most cases, there are basic controls to hide or show some elements, but not a way to control fonts, button styles, etc. Here is just one example:
Link to image: https://d.pr/i/nCVfmZ
It would be great to have you add your specific ideas about the missing features to the Ideas Board, which is where developers go to look for future plugin features and improvements.
Besides that, you may need some custom CSS code to style elements according to your vision. WooCommerce Customizations Page can help you find an expert who can do that for you, as it’s not something we can help you with directly.
I hope that’s helpful and points you in the right direction.
Cheers!