Removing Closed State from Agile Process template in AzureDevOps

As you know AzureDevOps Process templates can be edited and modified for each AzureDevOps Organization.

Some might have thought about whether we can rename state “Closed” for tasks and userstories to something meaningful like “Done” in Agile template.

But as of October 2019, AzureDevOps doesn’t allow that and when you try to add a new state to Completed category, it will display an error message as shown