As you begin downloading apps on the new Apple TV, you'll want to take the time to rearrange the layout. Doing so will ensure that you have your favorite or most used apps quickly accessible.
Unlike previous-generation Apple TV devices, you can now move apps in and out of the top-shelf, which had previously been reserved for Apple's own apps. Unfortunately, you can't delete Apple's apps.
With an app's icon highlighted, press and hold the trackpad on the Apple TV remote until the icon begins wiggling. Swiping across the trackpad will move the app icon. When you're happy with its new placement, click the trackpad once again to finalize the move.
Deleting an app from your Apple TV starts the same way: highlight the app icon, then press and hold the trackpad until the icon begins moving. Next, press the Play/Pause button on the remote. Confirm you want to delete the app on the following screen.