The changes affect only the selected element or data series. To change another series, click one of its elements, then make changes.
To select multiple series, click a series element, then Command-click multiple items, then drag.
Move all wedges in a pie chart: In the Format sidebar, click the Chart tab.
Below Radar Chart, do any of the following:
Change the grid shape: Use the options next to Grid Shape to choose whether you want the grid to be straight or curved.
Change the fill and stroke: Use the options next to Style to choose whether you want all series to have a color fill, a stroke along the edge, or both.
You can Use chart styles in Keynote on Mac