Use the Edit menu Redo command to redo previous actions that you have undone in the editor pane by using the Undo command. You can redo up to 256 editor operations, if required. This command is disabled when a command cannot be redone; that is, you have not previously performed an Undo action. (For details, see "Undoing an Action", in the previous subsection.)
To redo the next undone action, perform one of the following actions
Select the Redo command from the Edit menu
Press Ctrl+Y
The last undo action is then reversed.