I had the same problem on Thor Hurricane 29M. Called customer support and they gave me this link for setting the shade using the button hanging from the left end of the shade (probably the same as the red button in the original post).
MCD Windshield Shade Upper and Lower Limit Adjustment
This showed me how to set upper and lower limit on the shade for when ignition was off and when it was on so it wouldn't go down to far when being used for a sun visor while travelling.
Thor Forums
