The growth charts show the amount by which each log file is growing over time.
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Growth Chart Title Description
Growth: TotalMB Shows the amount by which each log file is growing over time.
Growth: Virtual Log Files Count Shows the amount by which each virtual log file is growing over time.

Click the arrow to the right of the chart title to change the growth chart on display.

The log 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 log files of interest in the Log Files grid. Hold down the Shift key to select multiple log files, or the CTRL key to select individual log files.