Create a Pie Chart
Pie charts and ring charts show the relationship between different values as well as the relationship of a single value to the total value. You can use a pie chart if you have a single data series with only positive values. Use a ring chart if you have a single data series that contains negative values.
For more information see Pie Chart and Donut Chart.
Proceed as follows:
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Go to Fields and drag the Sales field onto the worksheet, where you drop it on the Drop field to use as a measure tile.
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Drag the Region field onto the worksheet and drop it on the Drop field to use as dimension tile.
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The table is created. Under Properties > Visualizations, click on the pie chart icon.
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Under Presentation, select the option Labels and add a title: Sales per region.
Customizing the charts in advanced editing mode​
Once all visualizations have been created, switch to advanced editing mode to customize them. Toggle on Advanced options at the top right.

Proceed as follows:
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Select the ring chart.
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Click on Colors and Legend on the right.
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Deactivate Automatic colors. Under Custom, click the drop-down menu and select By metric.
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Deactivate Show legend.
The ring chart is ready. The color of the ring chart is displayed by key figure - the higher the value, the darker the color.
You have many options for the color display of the values. However, you should remember that colors have a specific purpose and should not just be used to make the visualization more colourful.