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Undo last action

Windows shortcut 
CtrlZ
Mac shortcut 
Z

This shortcut will allow multiple levels of undo; each time you use it Excel will step back one level.

Related videos

The videos below demonstrate this shortcut.
In this video, we'll look at how to extend a conditional formatting formula so that so that it checks more than just one condition.
In this video, we look at how to combine the FIND function with the LEFT function to extract the first name from a full name using a formula.
Pivot tables are very easy to create, but they still present challenges. In this video, we look at how to identify and fix 10 common pivot table problems.
In this video, we'll look at how to create a dynamic reference to a named range with the INDIRECT function. This is one way to switch ranges on the fly.
In this video, we show you how to move fields around in your pivot table.