When you open a new workbook in Excel 2007 or Excel 2010, it opens in [Compatibility Mode].
This problem occurs because Excel 97-2003 workbook is selected as the default file format in Excel.
To resolve this problem, follow these steps:
Start Excel 2007 or Excel 2010. (In this article, we use Excel 2010 for example).
Click File, and then click Options.
Excel Options window, click Save.
Under the Save files in this format drop-down menu, select Excel Workbook (*.xlsx), and then click OK.
Open an Excel file to confirm the issue is fixed.