I've configured thunar so that the network entry (and "Browse network") is hidden. However, when something network-related gets mounted, it reappears. That's fine but it would be great if it would be hidden again when all network resources have been unmounted. I don't see much use for displaying a parent item which doesn't have any children anyway? Ok, just noticed that it is gone when I close and open a new thunar window. Still, this doesn't seem quite right, it should hide immediately after all resources have been unmounted.
Fixed in 2458918.