Mercedes-Benz GLC : Through-loading feature in the rear bench seat (EASY-PACK Quickfold) / Adjusting the angle of the rear seat backrests (cargo position)
To enlarge the cargo compartment, you can
adjust the seat backrests so that they are ten
degrees steeper (cargo position).

Fold the seat backrest
forwards.
Move bracket
in the direction of the
arrow.
Push seat backrest
back to bracket
until the backrest engages.
Requirements:
The left and center seat backrests are
engaged and joined together.
You can lock the center seat backrest release
catch if you want to secure the cargo compartment
against unauthorized access...
Other information:
WARNING Risk of injury from unsecured
items in the vehicle
If objects, luggage or loads are not secured
or not secured sufficiently, they could slip,
tip over or be thrown around and thereby hit
vehicle occupants.
There is a risk of injury, particularly in the
event of sudden braking or a sudden change
in direction...
WARNING Risk of accident and injury
caused by an insufficiently secured vehicle
rolling away
If the vehicle is not securely parked sufficiently,
it can roll away in an uncontrolled
way even at a slight downhill gradient.
On uphill or downhill
gradients, turn the
front wheels so that the vehicle rolls
towards the curb if it starts moving...