@SwapMarket Yes, it's fully functional on the Pixel 10 Pro Fold and it's one of the recommended devices. It supports all of the folding features and you can use apps such as Pixel Camera with special support for it which will work fine on GrapheneOS.
https://grapheneos.org/faq#recommended-devicesThe other Pixel 10 Pro models have larger image sensors so the only downside aside from cost is not somewhat weaker cameras, but it still has very good cameras anyway.