Undo button
Undoes all changes except for those to the portfolios. If you click this button after changes have been made, the share price information reverts to the last-saved version, undoing all changes made since you last saved. If you click this button when the Save button is disabled because no changes have been made, the information reverts to the backup, which is the version before the last-saved version. Repeated clicking toggles between reverting to the last-saved and the backup.