Chevy calls it "remote start" and not "pre-conditioning" in the manual (using key fob). I did a quick 'search' thru the pdf version of the 2019 owner's manual and ...
Page 40 of the 2019 manual (Keys, Doors, and Windows -> Remote Start
) says :
Remote start will automatically shut off after 20 minutes unless a time extension is done. When the vehicle starts, the parking lamps will turn on.Instruments and Controls -> Vehicle Personalization -> Remote Lock / Unlock / Start
Pg 148-49 describes how to modify for lock/unlock, but not for remote start.
Details on finding digital copies of the owner's manual can be found here :viewtopic.php?f=11&t=8353