This feature is available in all editions.
I accidentally added some unnecessary environments to the Environment drop down of a Test Set. How do I remove unwanted environments?
Environments cannot be deleted, but they can be closed so that they will not appear in the Environment dropdown.
An Environment can be accessed from the details page of a Test Set which is assigned to it. From the Test Set details page, click the Environment name to open the Environment details. Use the action menu in the top right corner to close the environment.
Alternatively, you can access environments via the API, and use our http post utility to close the environment. See API for more information.