How come plugins remain active

Man this stuff still confuses the hell out of me --

OK -- if I have a plugin installed but not network activated -- it should show up in a connected sites plugins -- and let me activate --- correct???

If I have it network activated ----- then it does not show up in my individual connected site ---

Right now i have BP installed and W3TC installed but not network activated -- and they do not show up in my individuals sites plugin area --

I am trying to shut off plugins so I can test an error -- but they are not network activated, and they arn't in my individual sites plugin list -- but they are in the settings --

So how in the hell do I get rid of them to test