Panning and Zooming in GeoGebra Applets

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To pan, hold the Shift key while dragging the background.
To zoom, hold the Shift key while using your mouse scroll wheel.
Create a zoom window by clicking and dragging the right mouse button.
To rescale an axis, hold Shift while clicking and dragging an axis.
To zoom in or out quickly, hold Alt-Shift while scrolling.
You can reset the zoom by right-clicking and selecting "standard view" from the context menu.

Marc Renault, Created with GeoGebra