Mirrored VR Window doesn't want to Maximize neither go fullscreen

Development Rendering
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2

All right guys. After updating to the 4.12 everything works fine ! I have my mirrored VR window in WindowedFullscreen as exepected.

Here is my final code

GEngine->GameViewport->GetWindow()->MoveWindowTo(FVector2D(0, 0));
GEngine->GameUserSettings->SetFullscreenMode(EWindowMode::WindowedFullscreen);
GEngine->GameUserSettings->ApplySettings(false);

APlayerController* PController = UGameplayStatics::GetPlayerController(GetWorld(), 0);
PController->ConsoleCommand(TEXT("stereo on"), true);