Edit Menu: Undo Modify/Redo

In a graphical edit operation, if the current operation is not satisfied, the "undo" can be used to cancel the current operation and return to the state of the previous operation; after the current operation is revoked, the "redo" function can be used to restore the canceled operation. This is one of the most common functions of editing.

corresponding to "undo".

corresponding to "redo".

These two operations have shortcut keys Ctrl+Z and Ctrl+Y.