AVer HVC130 user manual - Manual (Page 37)

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2. Select System Setting > General Setting and press
.
3. Select Monitor and press .
4. Select Monitor Aspect Ratio drop-down box and
press . Choose the appropriate aspect ratio of
the display device you using. If you want the
system to automatically detect the right setting,
choose Auto. Press to make the selection.
5. Enable/disable TV Underscan to reduce the image
to display the black boarders when using HDMI
video output.