Give option to set lower bounds of charts to 0

Currently, the charts automatically change their upper and lower bounds to fit the data being charted. (For example, my Sleep Duration chart has 5hrs as its lower bounds and 11 hours as its upper.) Could you add an option for me to manually set the lower and upper bounds? I’d rather have the lower set to 0 at all times.

This is to fix the “truncated graph” problem, which can cause a chart to display the data in a misleading way.