Graphing in extended data

I graph my voltage in extended data for each phase but the Y axis spread is so large it barely shows a difference. its good to know what phase im drawing more power from so I can get my phases quite balanced but at a general look I cant see anything.
can it somehow work out the smallest and largest number and spread it from top to bottom? or have the increments in 0.5 or 1?

The extended graph automatically set the range and scales based on the data set. There could be an option to allow a min/max value for each axis, to be set either explicitly or based on the data.