Set Face ColorKeyCreator \ Tools \ Face-Tools \ Set-Face-Color
Use this function to change the color of individual faces. The function used to be called up in Tools>Face Tools but is being phased out by the Part Splitter Material tab and in Edit>Entities>Set Material Properties.
Change the Color of Individual Faces Using…
Specify whether to change the color of individual faces using the Color Dialog or by selecting the face of a solid.
Reset Bodies to One Solid Color
When selected, bodies whose individual faces are of different colors will be reset to one solid color.