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In the chart, select the "Chart Title" box and type in a title.
Chart Title
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Select the + sign to the top-right of the chart.
Select Chart
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Select the arrow next to Chart Title.
Chart Title
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Select Centered Overlay to lay the title over the chart, or More Options for additional choices.
Center Overlay
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Right-click the chart title to format it with options like Fill or Outline.
Fill or Outline