I can't seem to find a way to start a new one/erase all other than just deleting the unique end part of the URL and reloading.
We are re-structuring various sections of the interface to make that options more apparent.
Thanks!
Also sometimes the Undo button just doesn't do anything and gets stuck highlighted yellow. I'm not sure how to "unstuck" it and get undo to work, so instead I have to refresh and lose all the settings.