(If anyone experienced in UX dev can do this, please send in a PR.)
So as not to be confusing I’ll explain with pictures.
graph I get when I simulate with desired retention = .85
graph I get when I simulate with desired retention = .95 just after that
graph I get when I use the legend to hide graph 2
I think it’d be more convenient if the scale on y-axis and x-axis also changed upon using the legend to hide one of the lines.