Correct mistakes

In case you change your mind or make a mistake, Adobe Premiere Pro provides several ways to undo your work. You can undo only those actions that alter the video program; for example, you can undo an edit, but you cannot undo scrolling in a window.

Do one of the following:

To undo the most recent change, choose Edit > Undo. (You can sequentially undo as many as 100 recent changes made to the project in any Adobe Premiere Pro panel.)
To jump to a specific state of the project since the project was opened, select an item in the History panel.
To undo all changes made since the last time you saved the project, choose File > Revert.
To undo changes made before the last time you saved a project, try opening a previous version of your project in the Premiere Auto‑Save folder, and then choose File > Save As to store the project in a location outside of the Premiere Auto‑Save folder. The number of previous versions saved depends on the Auto Save preference settings.
To stop a change that Adobe Premiere Pro is processing (for example, when you see a progress bar), press Esc.
To close a dialog box without applying changes, click Cancel.
To set all values in an applied effect back to the default values, click the Reset button for the effect in the Effect Controls panel.