Deleting/moving workspace in Rocket.Chat Cloud

We’ve set a up a few rocket.chat instances for learning/testing purposes. Along the way the installation used the same Cloud login - so now the Cloud account shows a number of workspaces, some of which are no longer required. How do you delete them?

In one instance it’s still wanted but needs moving to a separate Cloud account to allow an appropriate payment method to be associated, which seems not an option from within the install - so I’m presuming the first or main requirement would be to delete from the original Cloud account…