Ok, I understand your issue now, sorry I thought you were dealing with the rally point mechanic. I havent played around much at all with the Govern-commands section. Its very very poorly implemented IMO, having a few decent uses, but ship movements in this interface are by far too generalized. Yes, I see you dont have an option to go back to the "unassigned" value, which is first present there. You should certainly open a ticket on that, but hopefully they will ignore it as a new and better interface is hopefully coming soon. Nevertheless, your ticket will add pressure to either fix it or implement a new design sooner than planned.