Ok then set it up on the button in the widget to change the character material elements. Green button changing character material to green then yellow and so on for each button..
If your character has 2 or 5 material elements or so then set them all to the color you want.
P.s. if you want to change specific material elements on the character and not all you will have to add them in the “element index” and find out in the character mesh which index they have (the exact ones you want to change if you say you have 20). gl