[plushpuffin]

It happens whenever the app reloads. If you swipe up (on iOS) to quit the app and then re-open it, you'll see it start off on For You.

[wut42]

What do you mean by "reload" ? I just tried on iOS to "exit" the app (swipe up in task manager), restart the app: it kept showing me the chronological timeline, like I picked last time.

Also- this random behavior is totally different on my couple of alts on the same iOS app.

[plushpuffin]

Well, your behavior differs from mine, then.

When I quit and reopen the app, or choose one of my custom lists and then tap home, it switches to For You.