Add & edit a chart or graph - Computer - Google Docs Editors Help
https://support.google.com/docs/answer/63824?hl=en&co=GENIE.Platform%3DDesktop
WebBefore you edit: Titles and subtitles can be added to line, area, column, bar, scatter, pie, waterfall, histogram, radar, candlestick, or treemap charts. On your computer, open a spreadsheet in Google Sheets. Double-click the chart you want to change. At the right, click Customize. Click Chart & axis title.
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