Documentation

Gradient Color

If your selected Fill Mode is “Gradient to a single color”, the inner point of the gradient will use the Base Fill Color or Category Colors (if applicable) for each slice, but the outer point will use a manually selected color for all slices. With this setting, you can pick the color that will be used as the gradient end point. The default setting is black, but you can use the Power BI color picker to select your desired color.
This setting is available if Pie Chart on Nodes toggle is enabled, and the selected Fill Mode is “Gradient to a single color”.