My viewport always has grey around it

[Astarion1]

version 4.5.1

Hi ive just started using godot and have this problem, im following a turtorial and his game always fill the viewport all the way, mine always has grey bars and wont fill the screen, ive messed with all the stretch modes and aspects in the project settings and they all change nothing.

[gertkeno]

The game embed window may be preventing your project settings stretch mode from working, you can change how the game embed scales with these three buttons. Try the project settings again while using the last of these three buttons, for full scaling.