Reverses a change that you made to an archive.
Some tasks, such as
Adding,
Removing,
Renaming, and
Replacing files can be reversed if you make a mistake. Clicking an item in this menu will reverse the change that was done. Clicking an item lower in the menu will undo all tasks before it too. If a task is undone, you can redo it using the
Redo menu.

This is the button to Undo a change