They can fix it on their end; nothing you can really do. This is a coding issue, and them not accounting for your device being in portrait, but only having half of the height.
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Who is 'they'? OnePlus or epic games?
Then why does it work on Samsung phones? I have noticed that the open doesn't even try to re-scale some apps. Like in pop-up mode it will just be a tiny 16x9 instead of the right ratio.
It's not a deal breaker, I still prefer it to the fold6, but I'd like to get back some of the functionality I had for years