This is only valid for default airplanes using a default Fuel system (most of the add-on airplanes are not using this system) and when NOT using Simbrief, which of course in both kind of airplanes (default or not default fuel) is the better option, compared of having you to needlessly type a fuel quantity you already planned.
Very likely caused by not using it correct as suggested in the manual, that is opening it with a mouse click on the Toolbar only the first time you call GSX for that session, then only use the Hotkey to open and close, then closing it from the Toolbar after takeoff or before ending the flight.
Now I am confused: are you really reporting as a problem fact GSX does exactly what that option is supposed to do ? It’s an option precisely so you can disable if you don’t like it.
The reason for that option is just a precaution, to be sure GSX won’t cause any Simconnect traffic during the flight (so its impact would be exactly 0) AND to prevent that bugs in the Navdata API or the Navdata itself in some areas could possibly cause crashes when the Navdata is queried to get a list of nearby airports.
Insane boards a full 777 in less than 15 minutes.
Another thing that has an option clearly explained in the manual, to have GSX permanently ignoring the gate radius no matter how larger your airplane is.
The menu IS supposed to close, because the whole concept of GSX is you choose an option and then you don’t need anything from GSX until later on, so it would be completely useless having a menu taking valuable space on screen and also covering instruments click areas.
Of course, if you use the menu correctly as explained in the manual ( see my previous explanation ), so you never act on the Toolbar except for the first time you call GSX and you always use the Hotkey to open or close it during session, it would be way easier to use, faster to open and you won’t get all the side effects of missing text notifications or pop-ups menus in the middle of a service.
That’s the only reasonable complaint, so we’ll look into it. Right now, you can sort of obtaining a similar result by selecting “Restart GSX” from the menu.