The History panel records the changes you make to a project. For example, each time you add a clip, insert a marker, or apply an effect, the History panel adds that action to the bottom of its list. The tool or command you used appears in the panel along with an identifying icon. You can use the panel to quickly undo several changes. When you select a change in the panel, the project returns to the state of the project at the time of that change. The more recent changes turn gray and disappear when you make your next change.
The History panel records changes only for the current session. Closing a project or choosing the Revert command clears the History panel. While the panel lists most changes, it does not list individual changes within some panels, nor does it list program‑wide changes, such as Preferences settings.