Question

The button is used to cancelled the last operation *​

Answer 1

$\huge \sf \bf {\boxed{\underline {\red{\underline {✠Aɴʂᴡᴇʀ࿐ :−}}}}}$

The undo button

shortcut:ctrl+z

Answer 2

The Redo button (located to the right of the Undo button on the Quick Access Toolbar) essentially cancels the Undo command. If you have undone too many actions, you can click the Redo button (or click Ctrl + Y or F4) to return commands that were canceled.