How it is done depends on the coach you are driving and the control panel installed. If you have the control panel with the LCD display, it will tell you the level condition from front to rear and left to right in the form of a number.
If I remember correctly a negative number from front to rear indicates the front end is low. for example -0.2 indicates the front end is 2/10 of a degree low. 0.0 indicates level.
Some of the coaches do not have the LCD for the levelers and must use the indicators on the arrow buttons.
For auto leveling the system first grounds the front jacks, then grounds the rear jacks, then levels front to rear, then levels left to right.
Also, for those with the LCD display, who may not have noticed, if you cycle through the menu one of the displays is Battery Voltage. If the battery voltage is less than 12.7 do not try leveling or you will get the low voltage error. Happened to me again yesterday leveling the coach in the driveway. I pressed auto level too soon after starting the engine. I pressed enter to confirm the error waited a minute the voltage then read 13.1 and I leveled the coach without issue.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054