Change a chart’s type in Keynote on Mac
You can change a chart from one type to another—for example, from a column chart to a bar chart, or from a 2D chart to a 3D chart.
Click the chart to select it, then, in the Format sidebar, click the Chart tab.
Click the Chart Type pop-up menu at the bottom of the sidebar, then choose an option.
If you can’t edit a chart, you may need to unlock it.