Custom subdomain configuration missing in Studio

Before Manifold updated Studio, I setup a custom subdomain on my website to host one of my mint pages:

mint.mugclub.wtf => app.manifold.xyz/c/mugclub-tavern-mug

After the updates to Studio I lost the ability to configure this, as custom subdomains are no longer exposed in the admin UIs.

I would like to update this subdomain to point to another (new) token on my contract. is such a thing still possible? If this is no longer available via Studio UI … is this something that someone on Manifold team could update for me? (Just need it to point to a new contract: app.manifold.xyz/c/mugclub)