I launched the game to try the new game+ update but i dont know how to adjust the resolution, if I try fullscreen it looks horrible and if I change to windowed its too small and cant adjust the size of the window. Any help please?

I intend to play this in windowed mode 1600x900

I would like to know if there is a way to change the window size of the windowed mode as well cause it is extremely small. I checked config files for it but nothing. The only workaround I had so far is to change the resolution of your screen in windows to something else en then enable to windowed mode. Still that is a hassle and not really great.