I am currently trying to play Haere nga o nga Atua. I'm having the same issue with the screen not fitting on my "monitor", but for more than just the first menu.
I've had this issue with Unity built games before (definitely not just yours), and I am currently engaged in a very interesting discussion with ChatGPT about laptop+TV+Unity screen resolution chaos. It seems like Unity doesn't handle this tricky combination very well by default; but it's such a rare combination that most people don't notice it.
I'll keep pushing until I get it working; but you may have to be patient for that additional feedback.
XD