New Segment active button Background

Hi ,

I'm desperately searching the way to activate button status background in the new segment chart.

By default, it's not available and the button shows a black (Ugly) button background.

Could you please help me to figure what's hidden option, tick or whatever should I activate to make it editable by status (Default, Hover, Pushed ,Selected) ?

Sometimes I have to admit I'm wondering which blended spirit is behind the development of this software, not intuitive at all, at least for a latin guy....

I thank you in advance the community.