Show Free Space in Pie Chart

Question / Problem

Is it possible to add the free space to the bar chart?

Answer / Solution

The free space is added to the pie chart if the root of the scanned drive is selected and the according option is activated in the context menu of the pie chart. In other situations (e.g. if a sub-folder is selected or the "Number of files" mode is active), it doesn't make sense to add the free space because the relationship between the free space and the other values displayed is wrong.