I was following a tutorial on YouTube from Dikko on retopologying the face and when it had come to retopo the lips I wanted to turn off the Object Properties< Viewport Display < In Front on the reotopology and I couldn't see the model when facing it.
I guessed it was because I had another copy of the retopo face so I turned that off, but nothing happened.
While working on it I then thought "oh maybe it's the view < Clip start " Because I played around with that, Nothing. I tried importing the head sculpt to the project because I had separately sculpted the head in another blender project, the error is still being applied to the copy. So I guess I don't know what I'm doing