The rear armrest in the center of the rear seatback can be used (no occupant in the center seat) or placed upright.

WARNING
Never put your hands and fingers around the moving parts of the seat and armrest:
Putting your hands and fingers around the moving parts of the seat and armrest is dangerous as they could get injured.
Split Folding
Head RestraintsMazda 6 Owners Manual: Specifications
Engine
Electrical System
*1 Q-85 is designed for i-ELOOP system. Only Q-85 should be used to ensure correct
operation of i-ELOOP system. Consult an Authorized Mazda Dealer for details.
*2 Not for i-ELOOP system.
*3 This spark plug provides the SKYACTIV-G engine with optimum performance. Co ...
Mazda 6 Owners Manual: Split Folding
By lowering the rear seatbacks the luggage compartment space can be expanded.
WARNING
Do not drive the vehicle with occupants on folded down seatbacks or in
the luggage compartment. Putting occupants in the luggage compartment
is dangerous because seat belts cannot be fastened which coul ...