Click 
or choose Undo in the Edit menu to undo your last change or command. In many cases you can undo a series of changes. Use it to:
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cancel recent changes to zoning one by one.
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cancel recent changes in the Text Editor one by one.
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cancel page deletions in the Document Manager or in thumbnails one by one.
To redo a command you have undone, choose Redo in the Edit menu. You can redo a series of undone actions.
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When you rotate an image manually, any zones of the image and the recognition results are deleted, after you confirm the command. These deleted items cannot be restored by Undo.
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Reading order changes can be undone. When the Change Reading Order tool 
is clicked, a separate undo button appears in the Text Editor ruler.
