With both sets of Atwood electric jacks I have had on our Canyon Star, after Auto leveling I've been able to turn them back on with the power button and fine tune the leveling by momentarily pressing EXTend (or RETract) until the corresponding LED is lit, then pressing the buttons to raise (or lower) the corresponding end or side as Lori said.
I manually level a little differently than Lori: Turn the power on, press extend and all and they will all extend to the ground and stop. I then follow the manual procedure above to level the coach.
The second post in this thread
has a link to the manual which has the method to set the auto level.