Aposonic A-S0402R21 - Manual (Page 21)

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 X2
(Mouse: )
Press this button to
(a) show/hide the zoom window if the current zoom factor is X1/X2, or
(b) zoom out the video window back to zoom factor X1 if the current zoom factor
is X4.
 ESC
(Mouse: or Right Click)
Press this button to escape from Digital Zoom mode, and return to normal full
screen display. The video window will always return to zoom factor X1.