If you need to browse to ONVIF cameras that are connected to POE ports on your NVR, then you can direct-connect your PC/laptop to a spare port on the NVR - so that it can access the subnet.
But, you will need to adjust the settings of your Network Interface Card on your PC so that it has an IP address within that same subnet network range.
Obviously, that is a faff if you have to do so repeatedly, and you may be better to add the ONVIF cameras to your LAN via a POE switch (than add them/their LAN IP addresses to the NVR), so that your PC can access the cameras at their LAN IP addresses from the PC with it's usual connection to your/same LAN.