I am managing svn with a third party application.
How do I remove all version control associated with a project in IntelliJ?
Just to add to the answers above. For one of my projects I had not only VCS (git) enabled, but also connected it to a remote repository. To start from a clean slate you can,
File | Settings | Version Control and click -. This will disable the VCS and list it under Unregistered roots:Unregistered roots: entry and all of the tracking information, go to your project folder and delete the ..\projectDir\.git\ folder also (provided that your were using git as your vcs)