The Region selector will be removed from the login screen starting next week
Over the past few months we’ve been transitioning all players from League of Legends accounts to Riot Accounts. Now that most players have made the transition, we’re going to be taking the next step towards enabling Riot’s long-term capabilities towards supporting multiple games: removing the region selector from the login screen.
Don’t worry: this update will not stop you from playing in different regions (or on PBE). Instead, since your Riot Account is now globally unique and each account is linked to a specific League of Legends region, you’ll just need to log in on the Riot Account associated with that region to play there. You can read this article for more information.
If you haven’t yet updated to a Riot Account, you’ll get an error message when you try to sign in and will not be able to get past the login screen. At this point you’ll need to head over to the account update website before you can play. You can find out more about the Riot Account update by checking out this Riot Support FAQ, which includes more details, some additional context, and a few tips that might help out.