I am not sure this answers your question but the VPN Policies menu is illogical and near impossible to understand. Have a read of this:
For example, why would there even be a “Use VPN for all processes on the router” when you are in the VPN Policy menu to do exactly the opposite of that?
Policies also seems to interfere / over-ride the kill-switch which I think should be the command that is superior to all others.