For closer map inspection, the Zoom toolbar button opens a small window.
The rectangle shows the part of the map appearing in the large window. Use
the left mouse button to move the field, to stretch or to compress. Display in the large
window will change accordingly. Compressing a rectangle from the corner simultaneous
diminishes both sides.
To zoom part of the map, press the left mouse button and without
releasing the mouse, draw a rectangle. When the button is released, this part of the map
zooms to fill the window. The displayed map can be changed only when the small General
view window is open.
The General View toolbar button
returns to the full map.