I presume that your have compiled your vi and created a .exe application. However, user still able to scroll the front panel when they stop the program.
I always practise this:
In your diagram, search for the quit/exit/stop button, which quits the application. Wire in a case a "Quit LabVIEW" function upon user clicking on the quit button. This will quit the application and exit from LabVIEW, thus preventing user from accidentally changing the front panel objects or scroll them up/down.
As for your own convenient, to quit the program without exiting LabVIEW can be done with [CTRL]+[+]+[.]
Note: Quit LabVIEW function can be found at Functions Pallates> Application Control> Quit LabVIEW
Hope this will help.
ian
_sg