Use the Environments page to remove an environment that you no longer need.
Deleting an environment removes all configurations and identity data but retains logs
and reports for 90 days. Deleting an environment cannot be undone.
Note:
To delete an environment, you must have the Organization Admin role, and your identity must exist in a different environment than the one you're deleting.
You cannot delete production environments. If you want to delete a production environment, you must first demote it to sandbox. Learn more in Promoting or demoting an environment.
The environment is removed from the Environments list.