Welcome cjk to the PC family,
That switch above the power mirror adjustment is the "heated mirror" feature. Leave it turned off unless your outside mirrors are snowed or iced up.
The owners manual that came with our 2007 PC was near worthless. It was a copy of a copy of a copy so many times over that it was hard to read. Yet even getting through it, there was nothing of great value anyway. So you are not missing anything.