you can try Alt+Enter

HERE'S WHAT TO DO
In Graphics Settings, set the aspect ratio to Force 16:9. Then click the Advanced tab and check the Widescreen Hack box.
I use this to play all my GC games in widescreen.
Please don't advise users to use the widescreen hack. It causes major visual problems in a lot of games.
lol this thread isn't about dolphin

yea this thread isnt about dolphin lol. by the way, i dont have that screen you posted anti ultimate. you know, that screenshot you posted that was in german. its not in my nvidia control panel for some reason, but thanks for helping

I dont play the game but im various games i use a program to resize the window even if its not resizable and sometimes the game reforms to the new window.
This program is specifically the WinMove command from AutoHotkey.