To close a tenancy you will need open up the property page and ensure that you are going to action this on an Ended Tenancy. You will not see the option to close a tenancy on any tenancy status other than "ended" - if you need to end the tenancy first please refer to the end tenancy guide first.
Go to Actions against the ended tenancy and scroll down. Under the Lettings section of the Actions menu you will see the option to Close Tenancy.
Once you click that, a confirmation window will pop up, outlining the actions that are to be taken.
For example, it will outline whether any bond held is to be returned to the tenant(s). It will also confirm the date in which this tenancy has been closed, which will show on the system within the audit reports.
You will then just need to confirm the actions and complete the process by selecting Close Tenancy in the bottom right hand corner.
The property profile will then refresh and the tenancy would've turned from Ended to Closed.