Fullscreen mode is automatically toggles on in Shipping build

Community Community & Industry Discussion
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Hello. I have a DefaultGameUserSettings.ini file in [MyProject]/Config folder with following settings:

[/Script/Engine.GameUserSettings]
    bUseVSync=False
    ResolutionSizeX=800
    ResolutionSizeY=600
    LastUserConfirmedResolutionSizeX=800
    LastUserConfirmedResolutionSizeY=600
    WindowPosX=-1
    WindowPosY=-1
    bUseDesktopResolutionForFullscreen=False
    FullscreenMode=2
    LastConfirmedFullscreenMode=2
    Version=5

FullscreenMode=2 means that I want to use windowed mode, right? In Development build - all is ok, game launches in 800x600 window. But in shipping mode, it launches in fullscreen. Why is it occurs?
I also have another issue with fullscreen mode: when my game toggles to this mode (through console command b.SetRes), 3D-vision indicator of my notebook lightning on, but if I use [Alt] + [Enter] for switching FS on, all is ok (I have a fully 2D game and don’t want to use some 3d features). How can I disable it?
Sorry for my English, and can you help me, please?