...
Map navigation options are set in the zoom toolbar item. After clicking the '+' button you can manually zoom in to a user defined map area. With the '-' button you can zoom out. Panning is possible after having clicked the hand button. From version 2008-01 the zoom in, zoom out and pan have been combined. After selecting the '' button, drawing a box from top left to bottom right zooms in, while bottom right to top left zooms out. Holding down the right mouse button allows you to pan. The buttons for zoom out and pan remain for users with only one mouse button.
Returning and moving forward between previously selected zoom extents can be done after clicking the arrow buttons. The drop-down allows you to select pre-defined zoom ranges.
...