How to change a class diagram background?

In class diagram, the class shape background is blue, How can I change it to white?

I couldn’t find anywhere to change it.

I find it finally. Took me nearly an hour!

Can you please share what you did?

Hi victor_viola,

You can right-click on the Class and select Formats….

Then edit formats in Formats dialog.
You can also Set as Default if you want the new formats become default.

Best Regards,


Hi @roykeung ,
thank you so much for the information but I forgot to mention that I need to do this using the OpenAPI.

I am trying to implement a shape similar to a class shape but I am having trouble implementing the controller.
Do you have any tips about this?

Thank you and have a nice day.