Undo
Reverses recent changes you have made, when possible.
To undo your last action:
Click Undo 
(Standard toolbar) or Edit, Undo, or press Ctrl+Z.
If you have exited a sketch, you can still undo actions in the sketch. Return to
Edit Sketch
mode and click Undo
.
To undo multiple operations:
-
Click Undo List 
to see the list of actions that are available. The most recent actions are at the top.
-
Select any action on the list. The action you select and all actions above it are reversed.