Other than setting the correct resolution for my monitor (5120x1440) I feel like I should be able to 'zoom out' a little.   This is what my view looks like, almost like looking through a letterbox.   I tried changing "Resolution scale" but that didn't make a difference.  Can anyone help please?

(2x example images;)

Why not ask in the game's comments where people who know are more likely to see your question?

Thanks