Mine came with the mirror folded back... I couldn't see the front half of the coach in it...huge blind spot. Moved it around forward to match the curb side and can now see along both sides from just forward of the front wheels (I can see all the tires and what they may or may not be into) and no longer have to worry about a Mini or motorcycle being in that blind area that I used to have. I also am more cognizant of what is around me since I don't have to turn my head to look in the mirror. A simple scan with my eyes can see out the front, down both sides, and all of my gauges.
You won't see a lot of big rigs or commercial buses with the mirror folded back alongside the driver for that reason. The newer buses, commercial and some upscale school buses come with the huge roof mounted arms that place the mirrors well in front of the vehicle for that reason...better vision down the sides.
Even in the "old" days, cars had their mirrors mounted out on the front fenders for that reason, you get a better visual arc the further forward they are mounted. I had an Austin Healey with the mirrors mounted out just behind the headlights. It was marvelous, I could see down both sides of the car without taking my eyes off the road and no blind spots. They were a PIA to adjust...get out, move it a bit, get back in check, get back out move some more... That is why they were moved up by the Windows, people were too lazy and wouldn't adjust them.
What you see in a mirror is defined by a cone. The closer your eyes are to the mirror, the less you can actually see of those objects that fall outside that narrowing portion of the cone.
Don & Bronwyn + 1 Cat; J-Lo
2014 Thor Tuscany 40RX (AKA, "The Cat House")
2015 Jeep Cherokee Trailhawk Towed