If the blade gets stuck during the initial operation and cannot be opened normally, just quickly open and close the sun visor to "shake" the blade to open. Then, if necessary, gently pull down the center of the bottom rail and/or the last blade.
Perform the same quick operation on the blades that are not completely closed, and then slowly roll the sun visor up into the top rail to flatten the blades.
The blades are not designed to completely block light. There is a light gap between the blades.