GMC Yukon 2007 Owner's Manual page 196

To access, pull the handle in the center of the
system up.
196
Slide the hinge covers to the center of each side.
This will keep the sides of the storage system
stationary and allow 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.
To utilize the cupholders, follow the procedure for
removing the system from the vehicle.