Disable GitLab Container Registry for existing Projects

Hello,

I’ve enabled the GitLab Container Registry following this doc on my GitLab CE.

However not all projects are requiring this feature. Therefore we wanted this option to be disabled by defaults and to the responsibility of the project leaders to activate or not when needed.

This is possible?

GitLab offers to disable the Container registryfeature for new projects only. What I wanted was to do that for existing projects?

Thank you