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Most changes made to a layer file can be undone in the event of a mistake. The label on the undo button describes the last task that can be undone. The undo button can be found on the tools menu or the edit tool bar.
If the undo button is grayed out it usually because of one of the following reasons:
•No editing tasks have been performed since last saving.
•The last task is too complex to be undone.
•The last editing task was too large to be remembered for undoing. Some example limitations are:
oDeleting or Renaming Entities approx 150,000 entities.
oMoving or Manipulating geometry approx 1,000,000 vertexes.
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