PLANET NVR-420 - Manual (Page 86)

You should see an area with blue border displayed on the live video area. Use the
directional buttons on the remote control to select a desired area. You are able to
choose from up to 9 different areas. When done, press the "ENTER" button on
the remote control to confirm selection.
7.4 Displaying Video in its Original Size
By default, the video is scaled to fill the entire video area. To view the video in its
original size, select the icon shown above and press the "ENTER" button on the
remote control to display the video in its original size.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420