Google has completed implementing their 'Designed for Tablets' feature which the software giant first revealed a couple of months ago. After the latest update, apps that have been designed specifically for Android devices with large screens are showcased in front. There are a ton of tablet-optimized apps on Play Store, and Google's update is simply to help you discover them (of course, they want you to download and use more and more apps with each passing day). Additionally, apps which are not designed specifically for tablets are now marked as 'Designed for Phones' to help the users clearly distinguish between the two.
Allow your tablet to connect to your home WiFi and update Play Store before you jump into the app, to enjoy the tweaked UI.