GMC Envoy Owner's Manual page 130

Lower Position
The panel can be stored in the lower position with either
side up. Insert the front corners of the panel into the
lower guides and slide the panel forward. Press down on
the back of the panel to lock it in place.
Notice: Loading objects that weigh over 200 lbs
(90 kg) onto the panel may cause damage. Repairs
would not be covered by your warranty. Do not
load heavy objects on the panel.
Vertical Position
Plastic grocery bags can be attached to the hooks on
the panel. Insert the front corners of the panel into
the vertical guides behind the seatbacks and slide the
panel down.
Notice: If you use the panel as a barrier for large
objects in the cargo area while the seatbacks
are folded down, the panel may be damaged. Do not
use the panel as a barrier between large objects
in the rear cargo area and the seating area.
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