Windows 10 changed and removed a lot of the network stuff, principally SMB1 support and WINS support.
The default is now SMB2 or SMB3, neither of which have the browsing and easy identification methodology which the network tab needs.
It is possible to reinstall some of the SMB1 support back into Win10, but there are security risks involved in doing so (search for “Wannacry” and you’ll find some details of the issues).
But what you can do is in Explorer use either the network name or IP address and manually connect to the MCM (e.g. in the address bar type \\MYCLOUDMIRROR or \\192.168.0.2 , but in each case replace the part after the \\ with the correct name or address for your specific device).
That should then make a connection and open up a list of all the available shares. It should also cause the device to appear until the network tab, although that will only last for the current window - if you close Explorer and open it again then you’ll be back where you were.