Zooming:
WINDOWS - Right mouse button then choose Zoom In, Zoom out or Show All. MACINTOSH - Control - Mouse button then choose Zoom In, Zoom out or Show All.
Moving left, right, up and down:
Press mouse button and while keeping it pressed, use the Hand icon to drag the map to a new position.
Changing image quality:
WINDOWS - Right mouse button then choose Low, Medium or High. MACINTOSH - Control - Mouse button then choose Low, Medium or High.

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