Just follow the underlying steps to get the desired result:
1) Open QuickBooks and Login to any file on the server.
2) Go To File > Open Previous Company > Set number of previous companies.
(Note: The option ‘Set number’ of the previous file is available only when the Server has two or more QuickBooks Files and you are logged into one of them)
3) On the dialog box that follows, select the number of files as desired, eg 2.
4) Click on OK. Close the QuickBooks and Re-open.