Status bar
Status bar below the main window displays information about the current location and status of the application.
2D/3D mode
Displays the current viewing mode and allows changing it.
Coordinates
Current mouse coordinates in 2D mode.
Group
Displays amount of points selected to the group. Mouse hover tooltip shows amount of single points, line points and lines in the group.
Editing mode
Current editing mode is displayed at the right end of the status bar. It shows the mode icon, name and Cancel/Done buttons for quitting it.