Jeep Wrangler 2020 Owner's Manual page 184

182 GETTING TO KNOW YOUR VEHICLE
To adjust the anchor loop, push down on the center button Lift the loop to use.
while sliding the loop along the rail to the desired position.
Release the button and move the loop slightly to the next
fixed position in the notches of the rail.
Lift Adjustable Anchor Loop
Adjustable Anchor Loop