I'm not sure when, but at some point they switched so that you don't pick a ___location for chains. E.g. you just order from "Wendy's" and Uber picks which ___location it comes from. That's why you don't see a dozen McDonald's in the list anymore.
It does tell you how far the ___location they're using is if you keep an eye on that. I've also been bitten because I forgot to check and Uber decided to try to deliver from a Wendy's 15 miles away instead of the one a quarter mile away.
If I just click the fast-food button, it only shows 1 McDonald's. But it's because it's a sponsored listing and I can still see the address of the store when I tap on it. It says it's 0.9 miles away.
It does tell you how far the ___location they're using is if you keep an eye on that. I've also been bitten because I forgot to check and Uber decided to try to deliver from a Wendy's 15 miles away instead of the one a quarter mile away.