While it is uncommon for a scenario to arise where the license must be removed from Veeam ONE, it can be done. Removing the license from Veeam ONE will revert it to the Community Edition feature set. The Veeam ONE license can only* be removed using REST API.
*If the Veeam ONE server is managed from a Veeam Service Provider Console, the license can be removed remotely.
The steps below will demonstrate how to remove the license using the built-in Swagger UI.