Virtual mirrors

I am trying to set up virtual mirror as a replacement to the real ones (sides and back). I keep encountering one problem though.

Whenever I activate virtual mirror on the top of the screen, the real ones are set up automatically. Obviously, when I set up the virtual one I don't need the real mirrors.

Is there a way to have one virtual mirror on top of the screen and disable the mirrors available in the car? I imagine it could save me a couple of fps.
 
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