it is no trouble setting the "settings"...

the problem is that :
I run my game and it is supposed to show in fullscreen, but it only comes up whit a window size 800x600.

It seems like gamestudio dont allow me to show it in a bigger window....?
but when I publish it whit the above settings . And then run the exeflie, it show the game in fullscreen.

Do you know why?