How do I remove the WD Quick view icon in menu bar?
For this particular app, WD provide an uninstaller. It should be in your Applications folder (look for "WD Quick View Uninstaller.app").

You will need to reboot before it is fully removed but it is disabled as soon as you run the installer (I was monitoring its network activity before and after).

It appears to be totally fine to remove it since it only provides information to the user rather than affecting any actual functionality of the drive. If your model of WD drive comes with a management console then all the information is apparently in there (this would be accessed via a browser. For a My Book Live it would be http://mybooklive.local/UI/ ).