The Data Files Growth chart shows the amount by which each file is growing over time.
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Use the Growth list to change the values displayed on the chart. You can display the File Used MB or the File Total MB.

The files displayed can be restricted by clicking the database(s) of interest in the Databases grid at the top of the drilldown. They can then be further restricted by clicking just the files of interest in the Data Files grid. Hold down the Shift key to select multiple databases or the CTRL key to select individual records.