ADLINK Technology RTV Series User Manual page 86

Press left mouse button and then drag it, display panel will appear
a green rectangle region which will be zoomed in. Keep pressing
Shift during dragging, the image will be zoomed in at the same
proportion of width and height. Shown below:
Press right mouse button, the cursor will become a move2D icon.
Then user can drag the image. Shown below:
76 ViewCreatorPro Utility