The "Edit Gradient" tool allows you to edit the properties of a gradient directly on the drawing.
When a gradient-filled element is selected, the user interface will show the instruments to edit the start and end coordinates of the gradient and the color positions for selection with the mouse.
By clicking inside it, new colors are created.
The color picker allowing color change is opened by clicking on the colors.
The animation below shows how to modify a radial gradient.
The animation below shows how to modify a linear gradient.