Undo/Redo
The Undo/Redo functionality allows you to easily undo or redo any changes to your model with a single mouse click. Undo and Redo are available in the Edit menu and as toolbar buttons.
- From the Edit menu, only 1 action can be undone/redone at a time.
- From the toolbar, if you select the drop-down arrow beside the Undo or Redo buttons, a list of all modelling changes will appear, from which you can select multiple (sequential) actions to undo or redo.
Undo
The Undo 
option allows you to undo changes to your model (e.g. loading, material
properties, etc). Any number of changes can be reversed with
Undo, starting with the most recent change and progressing backwards.
Redo
The Redo 
option allows you to restore changes that you have undone with the Undo
option. Redo will restore each use of the Undo option, starting with
the most recent Undo and progressing backwards. Redo is only enabled if
at least one Undo action has been performed.