wp 8.1 update 1

[Kiran Dev]

Hai...i downloaded the latest update for developers..as I logged in on fb(through ie 11) , the whole fb layout has been changed with an option to sort newsfeed according to time...the whole thing looked different but it was good...but as I refreshed , it returned back to normal with no such features.how can I get to the'more advanced fb'...can some one help??