By deleting a workspace all of the previous collaborators in that workspace will no longer have access to any of their murals. Before deleting a workspace, advise other workspace members so they have a chance to back up their murals.
To delete a workspace:
Enter into the workspace
Click on the workspace name and select "Manage Workspace Name"
Scroll down and select "Delete Workspace"
The workspace and all its content will be permanently deleted.
Instead of deleting a workspace, you can also choose to cancel the subscription to be able to pause the workspace and activate it again later by starting a new subscription.