QUICK!! ALERT THE COPS!!
No worries, some people are just dickheads and have to abuse other people instead of just simply explaining..
That little lever at the bottom of your rear view mirror, you grab hold of it with your thumb and index finger and just gently push it away or bring it towards you depending on if the previous person's mucked with it or not.. you dont need to move it sideways or anything.. you'd just see a dimmer version of your rear view.. but I dislike it cos sometimes I forget to put it back and when I need to look at it, it's in the wrong mode and can be distracting..
I accidentally discovered this when I was trying to hang something from that little lever lol