Wiki Theme locked, how do I unlock it?

So, I had from an old version of Vault Wiki, a fix that allowed me to create some nice looking infoboxes, but it only worked on one theme, so I locked the Wiki to that theme so it couldn't show up as any other theme.

Now, I've fixed it for all my themes, and I don't know how to unlock the themes again. I can change the wiki skin and I have no idea how I made it so the Wiki only uses that theme.

This is a Xenforo Website.

UPDATE

I figured it out. The option to override user Theme choice is in the regular setting, and I kept looking in the sections to do with styles and aesthetics.