G29 is the auto bed level gcode command. This should be in your starting gcode script of your slicer.
The way I understand it is that auto bed leveling is fine compensation. It's best to have a bed that is pretty level to begin with. I go around the four corners of my print bed with calipers and make sure the four leveling bolts have the bed and MDF within 5/100ths of a mm.
The auto bed leveling on the Wilson only takes four samples. It's not super accurate. I struggled for a while with one corner of my print bed having way more squish the the rest. Turned out to be slightly misshapen glass. Accidentally breaking that glass was a blessing in disguise.
I can't speak to the display of the coefficients as I don't have that display. Is it probing each corner twice? If so I'd say it's doing the bed leveling routine. I think the coefficients are displayed in the Arduinos serial out. You could connect a USB cable and see if you can read them via the Arduino IDE.