There is a winter and summer resting spot for the wipers. In the winter you want them up high so they don't get iced up, (assuming you are in a cold climate), and down low during the summer.
Your owners manual explains how to set the blades by pulling on the arm to rest in either up or down position.
Leave it to Lexus... they think of everthing.
Wow, I did not know that. Thank you Rusty!