Distributions can be visualized as curves by using the Curve Editor, and the curves for a specific module can be accessed by clicking the little graph icon on the module.
The sections at the left of the curve editor are the properties that support Distributions in the module.
Within those sections, you will see a number of smaller boxes. The boxes indicated by the "1" show or hide the individual data curves. For example: a color will have red, blue, and green curves, the boxes on the left will show or hide them in the curve editor.
The yellow boxes indicated by the "2" hide all the curves of the track.
Below are the most commonly used controls in the Curve Editor.