Originally Posted by
GraphiteGhost

Only way I know of, is to set the seat higher. If that isn't workable I have no suggestions left. Good luck! ;(
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Speaking of that, I found that doing so really helps around sunset when the sun is straight out the driver's window.
Since you can't rotate the visor, the only other choice is to block the sun with your hand.
BUT !
If you raise the seat way up till your head hits the top, then the sun is out of your eyes