Hello,
The global setting are in the Options page / Dials tab or Groups tab.
And there is also third way for skilled users - using custom CSS styles on the General tab / "Custom CSS styles:". That way you can change any visual aspect of your dials page.
I will be adding ability to create and share your own theme with others so that there is more visual options available.
Also please contact me to my support e-mail regarding the other things.

Best regards,
Juraj Mäsiar