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Go to previous workbook

Windows shortcut 
CtrlShiftTab
Mac shortcut 
⌃⇧Tab

Move to next / previous workbook window.

Note: in Mac 2016, Control + shift+ tab stopped working. However, Command + shift + ` will go to the previous workbook.

222 Excel Shortcuts for Windows and Mac

Related videos

The videos below demonstrate this shortcut.
Shortcuts to navigate workbooks
In this lesson, we cover shortcuts you can use to navigate workbooks.
How to navigate a workbook
In this video, we find your way around a an Excel workbook, and how to see where you are now.