The History panel (Window > Other Panels > History) shows a list of the steps you’ve performed in the active document since you created or opened that document, up to a specified maximum number of steps. (The History panel doesn’t show steps you’ve performed in other documents.) The slider in the History panel initially points to the last step that you performed.

To undo or redo individual steps or multiple steps at once, use the History panel. Apply steps from the History panel to the same object or to a different object in the document. However, you cannot rearrange the order of steps in the History panel. The History panel is a record of steps in the order in which they are performed.

To remove deleted items from a document after you undo a step in the History panel, use the Save And Compact command.

By default, Flash supports 100 levels of undo for the History panel. Select the number of undo and redo levels, from 2 to 9999, in Flash Preferences.

To erase the history list for the current document, clear the History panel. After clearing the history list, you cannot undo the steps that are cleared. Clearing the history list does not undo steps; it removes the record of those steps from the current document’s memory.

Closing a document clears its history. To use steps from a document after that document is closed, copy the steps with the Copy Steps command or save the steps as a command.