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The Undo button allows users to step-backward and cancel their recent changes to the model. Here are some helpful things you probably don’t know about it:
- The Undo button in Revit is hard-coded to hold 100 Transactions (individual actions, such a drawing a wall) or Transaction Groups (e.g. entering a sketch mode when using the Floor tool).
- Transaction number 101 will cause the very first one to drop off the list (it’s a FIFO behavior: First In, First Out).
- New to Revit 2012, however, is that a single Transaction Group can hold as many as 10,000 undo-able actions—so theoretically you could have as many as one million items in your Undo list!
- You don’t have to step back one-action-at-a-time—use the drop-down arrow then scroll down as far as you want to undo, clearing multiple steps in one click.
- After using Undo, the Redo button can recreate all (or part) of everything you just undid. But if you cause a new transaction to be added to the Undo list, the Redo list will be completely cleared.
- Keep in mind that there are a several actions which will completely clear out the Undo list, such as Closing and re-opening your file and unloading a Link!