GMC Cadillac XT4 2019 Owner's Manual page 309

308 VEHICLE CARE
1. Pull up on the rear of the floor
mat to unlock each retainer and
remove.
2. Reinstall by lining up the floor
mat retainer openings over the
carpet retainers and pushing
down to snap into position.
3. Make sure the floor mat is
properly secured in place. Verify
the floor mat does not interfere
with the pedals.