Any change made to the model can be undone. Undo can be done in two ways:

 select Undo from the Home tab of the ribbon

 click the Undo button in the quick access toolbar

 

An unlimited number of changes can be undone. The Undo command and hint text for Undo button show the name of the latest change to be undone, e.g. Undo create process step. Changes made to either the model elements properties or graphical properties can be undone. Changes made to child window options cannot be undone.