Colour the Overset Mesh
 

Is there a way in star of giving the overset mesh a different colour to the background mesh?

Thanks

yes - create a section plane or threshold with just the overset region as the input part, and another section or threshold with the other region as the input part. then place each of these in separate displayers in a scene and set the color of each displayer as required (mesh or surface etc)

if you don't want to assign custom colors to each region then the easier way is to place a section plane through both regions, the in the mesh displayer set the color mode to distinguish regions - let work, but you might not be happy with the default colors

You can also use the overset field functions and representation to display active etc cells - maybe not as pretty or customizable