Chevrolet 2008 Owner's Manual page 127

CAUTION:
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If you were to carry things on the adjustable
panel when it is in the upper (cargo cover) or
center positions, during a sudden vehicle
movement or a crash, those things could be
thrown around in the vehicle. You or others
could be injured. When it is in the upper or
center position, always secure any cargo on
the floor beneath the panel/cover.
To use the panel in the second position:
1. Insert the front corners of the panel into the top
guides.
2. Slide the panel forward.
3. Press down on the back of the panel to lock it in
place.
The third position is with the front corners placed in the
lower guides and the rear corners placed in the
upper guides. Do not load cargo on the panel in this
position.
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