How separate different excel file in different Excel Window

Dear Sir/ Madam,

I have a problem regarding the Microsoft Excel window always using one window to display all different files. I am using Microsoft office Professional Plus 2010 and OS is Window 7, previously my Excel is working well, but one day it start always group all my opened excel files into 1 window for view, I don't know why and I can't find the way/ switch to correct it back.

Please help to advise the way to fix it.

Thank you very much in advance for your kindly help!!

Best reagards
Andrew

To show separate icons on the taskbar, right-click the Taskbar. Select Properties > Taskbar > Taskbar buttons: Never combine.

Hi Sadath,

Thank you very much for your reply. But the problem not happen on Microsoft window, it happen on my EXCEL and how do I open a workbook/file/whatever in a window separate from an already opened file in EXCEL.

Best Regards
Andrew