The Undo and Redo facilities
The Undo command can apply to any of the following actions:
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Property changes
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Cut or Delete operations
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Object moves
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Object creation
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Object deletion
To undo one of these actions, click Edit > Undo or press Ctrl+Z.
There are unlimited levels of Undo.
When you have undone an operation, you can redo it by clicking Edit > Redo.
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