Windows game renders at a higher resolution when switched from UE5.4 to UE5.7

Development Rendering
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I am working on a couple of 2D games in C++

They are fixed at 1920x1080 and I even set the screen resolution to 1920x1080 fullscreen on startup

	UserSettings->SetScreenResolution({1920, 1080});
	UserSettings->SetFullscreenMode(EWindowMode::Fullscreen);
	UserSettings->SetResolutionScaleNormalized(1.0f);
	UserSettings->ApplySettings(false);

This following camera setup filling the whole screen worked fine in UE54 until now building on UE5.7

Camera->ProjectionMode = ECameraProjectionMode::Orthographic;
Camera->OrthoWidth = 1920.0f;
Camera->AspectRatio = 9.0f / 16.0f;

For some reason in UE5.7, it’s all changed - the width value 1920 seems to zoom the camera out and the game is rendered smaller in the middle of the screen? If I decrease that number now to 1080, the game appears back to normal scale, which I don’t understand as 1080 is the height

Is UE5.7 doing some sort of scaling?

All I did was upgrade my project to UE5.7, I didn’t change any settings