CrystalMaker keeps track of changes that you make to a structure plotted in a particular window, allowing you to progressively undo or redo changes.
To undo a recent change:
Use the Undo command from the Edit menu.
Note that this command can be repeated, so that you can progressvely move back to earlier stages of your work.
To redo a change:
Use the Redo command from the Edit menu.
Note that this command can be repeated, so that you can progressvely move to later stages of your work.