The Undo option is available on the Quick Access toolbar, alternatively the user can use the shortcut key combination Ctrl+Z.

The Undo functionality is controlled by the Undo button visibility setting under System Configuration in Diagrams Options.

When the Undo Button Visibility option is set to True, then the Undo button is visible in the Quick Access toolbar. The button is hidden when the setting value is set to False.

If the user uses the shortcut keys Ctrl+Z when the option is set to False, the below warning message will be displayed.