Setting for Assembly display with activated component

Can anyone tell me where or what the Creo 3.0 setting would be that controls the way your assembly displays when you have a sub-assembly or sub-component activated? For some reason (probably my own fault) when I activate a component my graphics display does not change. I would like to have it set so that when I do this, the rest of the assembly is de-emphasized, turned gray and or translucent etc.

It works this way for others here, but nobody can tell me where the controlling setting is at.

Thanks in advance