Yes for contracts deployed from Dec 1st, you can go into studio, select your contract, then settings. There you can enable OpenSea’s marketplace blocker (and then have royalties enforced).
For contracts deployed from November 8th until Dec 1st, we’re working closely with OpenSea on a solution, hang tight.
For future updates, follow the pinned thread: [Release] Manifold Creator Core v2.0.0 Update🎉
Or twitter.