You can disable and enable projects from the Project view.
To disable a project, right-click a project in the Project view and select Disable Project.
When a project is disabled, it is not accessible from any of the other views, including the Version Control view, and the project is converted to a placeholder in the Project view.
To enable the project, right-click the project placeholder in the Project view and select Enable Project. The project is again accessible in the other views.