Push the OFF button of the front to turn off the air climate control system. You can still operate the mode and air intake buttons as long as the ignition switch is in the ON position.
Hyundai Elantra AD (2016-2020) Owners Manual: LCD Display (For Supervision Cluster)
LCD Display Control
The LCD display modes can be changed by using the control buttons on the steering
wheel.
(1) : MODE button for changing modes
(2) ▲, ▼ : MOVE switch for changing items
(3) OK : SELECT/RESET button for setting or resetting the selected item ...
Hyundai Elantra AD (2016-2020) Service Manual: Front Seat Frame Assembly Components and Components Location
Component Location
1. Front seat back frame assembly2. Front seat cushion frame assembly
...