The armrest is located in the center of the rear seat. Pull the armrest down by using the strap from the seatback to use it.
If your car is not equipped with a rear armrest, the rear cup holders are located at the back of the center console.
CAUTION
Hyundai Elantra AD (2016-2020) Service Manual: Air Cleaner Components and Components Location
Components
1. Air cleaner cover2. Air cleaner element3. Air cleaner body4. Air duct5. Air intake hose6. Breather hose7. Resonator
...
Hyundai Elantra AD (2016-2020) Owners Manual: LKA System Function Change
The driver can change LKA to Lane Departure Warning from the LCD display. Go
to the 'User Settings → Driver Assistance → Lane Safety → Active LKA/Lane Keeping
Assist /Lane Departure Warning/Off'.
Active LKA
The Active LKA mode provides more frequent steering wheel control in comp ...