Using specific gradients Layouts you are able to modify the gradient of a color. Those Layouts are editable if the color data base has gradients. If the color data base has colors, you can't edit the gradient. In such a case the gradient is only to show the percentage.
Press the next highlighted icon to see the options. In the menu list you can select to Color to gradients... or Gradients to color...
Select one of the gradient Layouts in your color library and chose the option Colors to gradients. Click on the color in the gradient that you want to modify. The color picker opens and you can change the color.
Select the color using the color space or values and press Ok.
This option is starting from a determined color that will carry out variations between patches of a certain percentage of color.