No way to switch VPN site if automatic connection is enabled
If you save your password and check the 'Automatically start connecting next time' box, there appears to be no way to uncheck the box, other than being super fast and accurate with the mouse and unchecking the box in the split second between the time you enable the VPN and when the window goes away.
Unsure what bits of the GUI are provided by NetworkManager and what parts are provided by the openconnect plugin, so perhaps this is the wrong place to file an issue...