CITROEN DS4 Owner's Handbook Manual page 158

Rear parcel shelf
To remove the shelf:
 unhook the two cords,
 raise the shelf slightly, then remove it.
There are several options for storing the shelf:
- either upright behind the front seats,
- or flat at the base of the boot.
Hooks
The hooks can be used to secure shopping
bags.
Access to the storage box
An additional hook under the shelf is
used to hold up the boot floor using its
cord, to facilitate access to the tools
and spare wheel or the temporary
puncture repair kit...