For anyone that either can't find their manual or just wants this spoon fed to them like I did:
LIFTGATE POSITION SETTING
The lift gate can be set to open to a specific height by performing the following:
1. Open the lift gate using the request switch or the Intelligent Key.
2. Pull the liftgate down to the desired position and hold the liftgate (the liftgate will have some resistance when being manually adjusted).
3. While holding the liftgate in position, press and hold the liftgate switch located on the liftgate for approximately 5 seconds or until 3 beeps are heard. The liftgate will open to the selected position setting.
To change the position of the liftgate, repeat steps 1-3 for setting the position of the liftgate.