I want to delete color presets from Automation cars.

So I'm making Automation cars for AI traffic purposes. The thing is, all exported cars have a default color palette preset, and I don't like it because they aren't very realistic car colors. I want to make it so that the AI traffic automation cars don't use the default color palette, and instead use a custom made color palette.

I know how to add my own color palette, but I can't seem to figure out how to delete color presets. It says to right-click on them to delete them, but right-clicking isn't doing anything. Could someone please help me figure out how to do this?

Btw, you can check out my automation cars here, incase you're interested: https://www.beamng.com/resources/authors/ostan5000.301116/

 

default paints are in the info.json file of the car.