For the 2017 Corolla is the green lane departure icon always supposed to be on?

#1
When I bought the car, I didn't notice it until I took it off the lot and the dealership had already closed. I looked in the manual and couldn't find the answer. Lane departure appeared to be working normally as when I left some space for walkers on a two lane road it made a sound. Just wondering if the green icon is supposed to be there at all times. It's always there when I turn on the car. I called the Toyota dealership salesperson, but he seemed like he didn't know for sure. This is my first car with lane departure (as well as my first Toyota), I just want to make sure the car is working as it should.
 
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