Undoing and Redoing Operations
It is possible to undo (and then redo) the last operations for operations like adding, disabling, moving, and deleting nodes in the Model Builder as well as changing values in the Settings windows. You can undo and redo several successive operations.
To undo the last operation or redo an undone operation:
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In the Quick Access Toolbar (Windows users) or from the main Edit menu (macOS and Linux users), select or click Undo () or Redo (). Clicking the downward-pointing arrow next to the button displays a menu showing each step in the available undo and redo histories, and you can choose any step to perform multiple undo or redo steps at once.
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Press Ctrl+Z (undo) or Ctrl+Y (redo).
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Copying, Pasting, and Duplicating Nodes
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Clearing Sequences and Deleting Sequences or Nodes
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Disabling or Enabling Nodes