Snapchat has just rolled out a massive update to users and people are not happy about it
The update shuffles around the core features, like putting Snapchat Stories from your friends on the Chat/Friend screen (to the left of the camera). Plus, there's a new algorithm that's supposed to order your friends by whom you speak to most. Meanwhile, swiping right from the Camera screen will bring you to Discover, which now has a full-screen, vertically-scrolling layout.
I personally think it looks weird, but I said the same thing about Facebook when they updated the layout. If you hate change, you will hate the new Snapchat! Honestly, the best way to avoid the whole mess is to turn off automatic updates.
Unfortunately, there is no easy way to downgrade Snapchat once it's been upgraded on your device, but there is a workaround, if you'd like to learn more about that, click here!