QNAP VS-2004L en - Manual (Page 73)

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Video Resolution: Specify to adjust the resolution automatically or use a fixed resolution.
To adjust the resolution automatically, the NVR will select the resolution setting* which
best fits the size of the IE browser window. Note that ‘Stream from network camera’ will
not be available if the IP camera does not support streaming from camera or video
resolution configuration. Both options will not be available if the IP camera does not
support multiple streams.
*If an IP camera supports different resolution settings, the NVR will select the smallest
resolution larger than (or equal to) the size of the browser window.
If all the supported resolution settings of an IP camera are smaller than the browser
window, the largest resolution will be selected.
Let me choose other cameras to apply the same settings: Select this option to apply
the changes to other IP cameras. Note that some settings may not be applied if the IP
camera does not support the features, such as streaming from camera or video resolution
configuration.