Main toolbar > Undo
Edit menu > Undo
Keyboard > CTRL+Z
Undo reverses the effect of the last action.
Right-click the Undo button to display a list of recent actions, where you can choose the level of Undo.
On the Edit menu, the name of the function to undo is also displayed. By default, there are 20 levels of Undo. You can change the number of levels in Customize > Preferences > General tab > Scene Undo group.
Some actions cannot be undone (for example, applying modifiers, deleting modifiers, and changing parameters in the command panels). When you know something cannot be undone, use Hold first. Then if you want to undo it, use Fetch. Hold and Fetch are also commands on the Edit menu.
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