Mercedes-Benz GLS 2023 Operator's Manual page 151

% Vehicles with a third row of seats (all vehicles
except Mercedes-Maybach vehicles): To
install the floor mats on the third row of seats,
slide the corresponding seat on the second
row of seats forwards.
Removing floor mats
Pull the floor mat off holders 2.
#
Remove the floor mat.
#
%
Vehicles with a third row of seats (all vehicles
except Mercedes-Maybach vehicles): To
remove the floor mats on the third row of
seats, slide the corresponding seat on the
second row of seats forwards.
Seats and stowing 149