At the top is the menu. Below this is the toolbar. Both of these are used to perform operations on sites, and/or retrieve more general information.
Below these bars is the main part of Xsitecopy's user interface. As is obvious from glancing at it, the UI is split into 2 main sections. On the left is a tree view with a tree node for each of the sites that Xsitecopy knows about.
If you expand a site, the files and directories that it is aware of will be shown in a similar manner to the gnome file manager, gmc. Clicking on a file or directory brings up information about that file in the right side of the window.