The front seat can be adjusted by using the levers located on the outside of the seat cushion. Before driving, adjust the seat to the proper position so that you can easily control the steering wheel, foot pedals and controls on the instrument panel.

Forward and rearward adjustment
To move the seat forward or rearward:
1. Pull up the seat slide adjustment lever and hold it.
2. Slide the seat to the position you desire.
3. Release the lever and make sure the seat is locked in place. Move forward and rearward without using the lever. If the seat moves, it is not locked properly.

Seatback angle
To recline the seatback:
1. Lean forward slightly and lift up the seatback lever.
2. Carefully lean back on the seat and adjust the seatback to the position you desire.
3. Release the lever and make sure the seatback is locked in place. (The lever MUST return to its original position for the seatback to lock.)
Reclining seatback
Sitting in a reclined position when the vehicle is in motion can be dangerous. Even when buckled up, the protection of your restraint system (seat belts and air bags) is greatly reduced by reclining your seatback.
WARNING
NEVER ride with a reclined seatback when the vehicle is moving.
Riding with a reclined seatback increases your chance of serious or fatal injuries in the event of a collision or sudden stop.
Drivers and passengers should ALWAYS sit well back in their seats, properly belted, and with the seatbacks upright.
Seat belts must be snug against your hips and chest to work properly. When the seatback is reclined, the shoulder belt cannot do its job because it will not be snug against your chest. Instead, it will be in front of you. During an accident, you could be thrown into the seat belt, causing neck or other injuries.
The more the seatback is reclined, the greater chance the passenger's hips will slide under the lap belt or the passenger's neck will strike the shoulder belt.

Seat cushion height
To change the height of the seat cushion:
Front Seats
Power adjustmentHyundai Elantra AD (2016-2020) Service Manual: Transaxle Control Module (TCM) Repair procedures
Inspection
Transaxle Control Module(TCM) Problem Inspection Procedure
1.
TEST TCM GROUND CIRCUIT: Measure resistance between TCM and
chassis ground using the backside of TCM harness connector as TCM side
check point. If the problem is found, repair it.
Specification: Below 1?
2.
TE ...
Hyundai Elantra AD (2016-2020) Owners Manual: Automatic reverse
If a window senses any obstacle while it is closing automatically, it will stop
and lower approximately 12 inches (30 cm) to allow the object to be cleared.
If the window detects the resistance while the power window switch is pulled
up continuously, the window will stop upward movement then ...