[qcj]

Tom, my slide window is one piece like this one.  I to did notice that is was down from the top a few inches.  Up to a year ago I could only raise mine all the way up or all the way down.  The upper latch that holds it at the top broke and it looks like the devil to get to, so I made a wedge to hold the shade any level of open I wanted it.  This might be the case here, because they have a pillar hiding something at the bottom of the shade.