Answer :
Final answer:
To ensure a workbook remains on the Recent Workbooks list, you can 'pin' the workbook by clicking the pin icon next to it.
Explanation:
To ensure that a workbook remains on the Recent Workbooks list in the Backstage View regardless of how many workbooks are opened subsequently, you can 'pin' the workbook to the list. To do this, you need to click the pin icon located next to the workbook in the Recent Workbooks list.