Undo and Redo

Toolbar Buttons:

The Edit menu > Undo and Edit menu > Redo commands, or their associated toolbar buttons, allow you to remove (Undo) or add back in (Redo) changes made to your model. These commands step you through your sequence of actions back to the last time you saved your model.

Both commands work sequentially; that is, if you have made sixteen changes to the model and then decide you want to remove (Undo) the seventh change, you must remove (Undo) change sixteen, then change fifteen, then change fourteen, and so forth until you get to change seven. The Edit menu > Redo command can only be used in conjunction with the Undo command; an Undo command must be performed in order for the Redo command to be active.