Cancels the last action.
Right-clicking over the Undo button displays a list of recent actions, from which you can choose the level of Undo.
Undo is also available in the Edit Menu, where the name of the function to undo is also displayed. By default, there are 20 levels of undo. You can set the level higher or lower in the General panel of the Preferences dialog.
Some actions cannot be undone; for example, applying modifiers, deleting modifiers, and changing parameters in the command panel.
You can press CTRL+Z to undo the most recent action.
To exit the list without performing an action, click the Cancel button, or click somewhere outside of the list.