GMC 2007 Yukon XL Owner's Manual page 180

The cargo management system can be removed
from the vehicle. This procedure should be
completed by two people. While squeezing the
release lever, pull the system back until the rollers
clear the guides.
On one side of the system is a retractable
storage area.
To access, pull the handle in the center of the
system up.
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Slide the hinge covers to the center of each side.
This will keep the sides of the storage system
stationary allowing it to stay upright. Inside the
system are two removable dividers. To remove,
unhook the loops at the ends of each divider. When
not in use, slide the hinge covers back and the
storage system will fold back down. Press down on
the storage cover to lock it into place.
On the opposite side of the system are
two cupholders.