To remove an office, navigate to the offices page by clicking on the offices tab.
Find the office in the list and click <Edit>
Click on the <Delete> button Located at the bottom of the page.
At the popup prompt you will be asked to confirm deletion.
Click Confirm to Delete the Office (Please note you will be unable to undo this action)
Alternatively Click <Cancel> to return to the previous screen.
For an overview of the Offices/Teams hierarchy and how they work in the windows 10 application please refer to the Introduction - Administrator Webpage article