Basically title. When I disable draft & publish from a content type and I click on finish, I get an error message in the API ID field that tells me that "this value is already in use by another content type".
What is causing this error? I just want to disable the draft and publish option...

Seems it's a bug in the admin panel. You could either edit the schema.json file or disable the option while creating a new collection.
src/api/[collection]/content-types/[collection]/schema.json
creating a new collection: