I have one project collection and several team projects underneath. One of the team projects is for a now redundant project and I want to hide this or inactivate it so it no longer shows up in the list of available team projects in the collection. Is there a way of achieving this without deleting the team project?
You can try to remove everyone from security groups of this project. If people don't have access to it, they will not see it. I think collection administrator will always see all the projects.