Canvas not resizing when app is changed to fullscreen

Questions & Answers
1

I have a canvas that is set to Screen Space - Camera and Scale With Screen Size and it works fine for when the app is in Windowed mode. But when i make it full screen using Screen.fullScreen = true, the canvas stays at the same aspect ratio it was when it was windowed. How can I fix it?

2

On your canvas under canvas scaling. You can select your canvas scaling mode. You have to set it to scale with screen size. Depending on whether it’s a vertical or horizontal game. You can adjust the slider. This affects how much each direction is scaled.

3

Didn’t solve it for me, (on 2021.2.19f1)
This code worked for me:

Vector2Int rez;
    public void ToggleFullScreen()
    {
        FullScreenMode mode;
        if (Screen.fullScreenMode == FullScreenMode.Windowed)
        {
            //Save the windowed size
            rez.y = Screen.height;
            rez.x = Screen.width;
            //
            mode = FullScreenMode.FullScreenWindow;
            Screen.SetResolution(Screen.currentResolution.width, Screen.currentResolution.height, mode); //This is the important part!
        }
        else
        {
            mode = FullScreenMode.Windowed;
            Screen.SetResolution(rez.x, rez.y, mode);
        }
    }