Windows Desktop Player - Magnifier

    Magnification, green square, area is opening on undefined location through “View/Magnifier” menu item:
Video Magnifier
Fig.1
   This magnification area can be moved and resized using mouse regardless of playback status and magnification being active or not – but as long as magnification area still displayed:
Video Magnifier
Fig.2
  Right mouse click within magnification area invokes popup menu to control zoom value and to close this magnification area which can be reopen any time later as long as video is open:
Video Magnifier
Fig.3
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