Ok thanks for your fast feedback. It's really quite difficult playing with this configuration at the moment so fingers crossed for a solution soon.
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And I've just tested it using my wife's "standard" monitor and the game looks like it should, I was right by saying the top and bottom are simply cropped instead of having extra screen real-estate. Compare this screenshot (standard monitor) https://imgur.com/a/iy8c4kI with the link I provided above. Very, very different.