There are no labels to display the min and max value in the inspector which makes this attribute not very usable.
Thank you for reporting this issue. We've been taking a hard look at the min max slider, and pretty much completely overhauled it.
The values will now be displayed, when you're hovering over the the slider, and there's an option to also have two float fields, so you can directly edit the values.
Clicking on the bar, no longer moves both the left and the right knob, but instead just moves the nearest one to the mouse position. You can still move everything at once by holding ctrl.