1.

The top menu bar provides access to the Application Menu on the left and the View Options on the right. It also contains shortcuts to interact with the selected data.

2.

In the directory tree a graphical overview of the scanned drive or folder is shown. The arrows in front of each subfolder can be used to expand this view and look into the subfolders' contents.

3.

The details list particularizes the scanned files. This view is optional and can be turned off/on with the View Options > Show Details option.

You might also use this pane to show a hierarchically structured chart, named TreeMap, to visualize your data. The TreeMap can be turned off/on with the View Options > Show TreeMap option.