Undo Changes in Excel 2010
You can reverse almost every action in Excel by using the Undo command. We can undo changes in 2ways.
From the Quick access tool-bar » Click Undo
Press Control + Z
You can reverse the effects of the past 100 actions that you performed by executing Undo more than once. If you click the arrow on the right side of the Undo button, you see a list of the actions that you can reverse. Click an item in that list to undo that action and all the subsequent actions you performed.
You can again reverse back the action done with undo in Excel by using the Redo command. We can redo changes in 2ways.
From the Quick access tool-bar » Click Redo
Press Control + Y