I ask in part because I'm not sure if this is a configuration issue on my end. In Photos (the app), the sidebar looks like this: Notice how it includes sections such as Memories and People. But in an Open dialog, the options available within Photos are arranged quite differently: In fact, this is so different that for the longest time, I assumed this was missing People altogether. It's not! For some reason, Albums suddenly contains, among other things, People: This makes little sense to me, because Photos doesn't do that. So what gives? Why do the two follow a hierarchy that's similar enough to fool you, and yet different?