Undo

Cancel the last operation to return to the previous state.
You can use any one of the following methods:

• Shortcut key: Ctrl + Z (⌘ + Z for Mac OS X)
• Click the "counter-clockwise arrow" button on the command bar.
  

Redo

Perform the last operation canceled by Undo again to revert the cancellation.
You can use any one of the following methods:

• Shortcut key: Ctrl + Y (⌘ + Y for Mac OS X)
• Click the "clockwise arrow" button on the command bar.
  

Operations Supported by Undo/Redo

When there are no operations that can be undone and redone, the respective icons on the command bar become grayed out.

• Changing the row height or column width
• Editing the cell value
• Zooming
• Deleting the range value
• Dragging to copy the value
• Dragging to move the value
• Pasting