QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 58)

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The NVR detects the resolution settings supported by the connected monitor and selects
the most appropriate setting automatically. To change the screen resolution, click
‘Settings’ under the ‘Screen’ tab. After configuring the resolution settings, you will enter
the monitoring screen.
If the monitor model cannot be detected, the NVR will provide the options 1400*1050,
1280*1024, 1024*768.