From the online manual
https://lci-support-doc.s3.amazonaws...cd_0001519.pdf
Zero Point Calibration
The “Zero Point” is the programmed point that the trailer will return to each time the Auto Level feature is used. The “Zero Point” must be programmed prior to using the Auto Level feature to ensure the proper
operation of the system.
The "Zero Point" feature is only available on the OneControl Touch Panel and OneControl App with this system. (Figs. 17-22 depict OneControl Touch Panel.)
Note: Prior to starting this procedure, double check all connections on the controller, jacks, and touch panel.
Note: When calibrating Zero Point, the user has full manual control over the jacks. See “Basic Jack Operation - Manual Mode” to adjust to the desired level position. Press the enter button to set.