
The Main Window is divided into the Playlist Table, the Status Bar, which shows some information and the Command Buttons.

This is where the overview of the iTunes Playlists is shown with the Name and the approximated size on disk, which is calculated upon the encoding settings. The first column let you select or deselect a playlist for exporting, which changes the values shows in the Status bar.
A double click on a playlist row opens a panel where you can sort and rearrange the tracks in a playlist.
The Status Bar shows how many playlists and tracks are selected, their calculated size and the summarized time of the tracks.

If you select some playlists the Status Bar updates.

When running an export task, the Status Bar shown the progress.

This button selects/deselects all playlists
This button opens the Settings Panel
This button opens the Info/Error Panel
This button let you select the export folder/device
This button starts the export process