On the route card at the top of Deliveries > Deliveries click Cancel Route and confirm "Cancel Route #X? This removes EVERY stop on this route and cannot be undone." Sprwt cancels the delivery in Root Deliveries and drops all its stops; every order that was on the route returns to Not Exported so you can re-export. You get "1 route(s) cancelled successfully" or an error such as "0 cancelled, 1 failed (reason)" if Root refused. Requires the manage-stops permission.