Add the ability to hide a process

For this, we've just created restricted access process groups and adjusted out all users from viewing and adding in only the users or roles/responsibilities that need to see it via Process Group Permissions.

As well as using restricted access groups as Sam mentions, you could simply not publish the process. That way it's only viewable by owner and expert.

Thanks for the feedback. As other commenters have stated you can achieve this by either using a permission restricted group, or not publishing the process. However there is still the idea of 'hiding' a process for personal use only.
We don't have this on our roadmap right now so we'll open this up for voting and gauge interest from other clients.