Lower setting is cargo setting for loading and unloading. Driving isnt advisable thats why car ECU automatically lift the car after 5km/h. Its more of safety feature than comfort/
For keeping it low, you can unplug the fuse of suspension but that might also disable self levelling in which case if any one side looses air it will not be topped and result in tilted ride. For lowering it permanently you can rip of air suspension and get low ride coil spring, that will dramatically KILL THE COMFORT of your ride but will give you the looks what you want. Good luck, hope it helps.