Close the Chart Data editor when you’re done.
If a column, bar, line, or area chart references a table with a large number of data points, the chart automatically shows a representative sample of each series to improve the performance of Pages. Downsampling doesn’t change or remove the data in your table, and only changes the visible data points in the chart.
If your chart data is being downsampled, a message appears when you click Large Data Set in the Chart tab of the Format Change the look of bars, wedges, and more in Pages on Mac