| How to | Do this |
| Undo the last action. | Select Edit > Undo, press CTRL+Z, or click the undo icon  in the toolbar. |
| Redo the last action. | Select Edit > Redo, press CTRL+Y, or click the redo icon  in the toolbar. |
The Miscellaneous Preferences allows you to adjust the number of undo operations you can perform. The default is 50.