SuperChart line color intensity

on Android App 2.27.18
Superchart doesn’t use for the line/fill of the dataset the color intensity set by the slider in color selector. The color intensity is applied only to the icon in legend. See the yellow on this chart.
Is this a know problem, with no simple fix or something what could be made better?

Screenshot from 2020-06-13 19-00-43
Screenshot from 2020-06-13 19-16-06