Located in Master and Sample Toolbar

To select an area in the image to magnify click Marquee Zoom. Select the area using your mouse - or scroll  with the track wheel.

To magnify the image scroll upward with the track wheel.
To reduce the magnification scroll downward with the track wheel. 

NOTE: On a Mac operating system, scroll upward with the track wheel if the Scroll Direction: Natural setting is ON.

To pan left-click in the Master panel. Hold and move the mouse around the panel.

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