If you have your hands full, such as when carrying bags, it can be useful for the trunk to open automatically.
If the vehicle is locked, using hands-free trunk unlocking will unlock either all the doors or only the trunk. This is enabled via door locking settings in the center display.
Make sure you have a charged distance-capable key on you.
Note
When you want to use the hands-free feature for closing the trunk, repeat the kicking motion once.
A short audible response indicates that it's about to close. If you try using the hands-free feature without a distance-capable key, three beeps will indicate that the trunk cannot close.
If the function appears to be unresponsive, keep in mind that obstructions to the sensor such as mud can interfere with a proper response.