How to change backface color rhino on Mac?



i was trying to change the backface color of my model in mac rhino according to a tut online for windows rhino. does anyone know where is the menu for that in mac rhino ?? That would be very helpful if someone can help me with it~~ thank you ~~


Display modes, I use it only in shaded mode.


Thank you very muck !!
You are so kind and have solved a big problem for me !