Hi Marco Negroni,
Greetings from Syncfusion
Currently we don’t have support to customize the color palette size. So, we have considered “Support to customize the color palette ellipse size” as feature request and please find the feedback task below here.
Please cast your vote to make it count. We will prioritize the features every release based on the demands and we do not have immediate plan to implement this feature since we committed with already planned work. So, this feature will be available any of our upcoming release.
Regards,
Ramya.