What is the purpose of Undo?
To undo the last edit operation.
When is Undo active?
When an editing operation such as adding, moving, or deleting objects or adding and deleting records operations have been performed. (Redo is enabled if an Undo has been performed.)
How do I access Undo?
On the HOME, and SPATIAL tab, in the Clipboard group, click Undo.
See also:
System Settings Preferences Dialog Box