Every ride I've taken with Uber has been exactly the fee presented before getting in the vehicle and with no tip expected. Eh? At what point do you give it a d

Every ride I've taken with Uber has been exactly the fee presented before getting in the vehicle and with no tip expected. Eh? At what point do you give it a destination so that it can present you with an estimated price? The only time it displays an estimated price RANGE is during surge pricing.