You can add apps; you can move them around to access your favorites more easily. You don’t need to settle with the layout that Apple TV offers you as default. You can use your top part of the remote for re-arranging the apps, tap and hold on any app to move the icon somewhere else on the screen. Tap again to confirm. To delete an app from the home screen entirely, tap and hold on it and then press Play/Pause to delete it.
The most recent tvOS updates have enabled folders too. Just like on iOS, you can drag an icon on top of another icon to instantly create a folder, which will keep your apps more neatly organized. Drag the app icon out to the edge of the folder, and it will return to the home screen grid.
In Settings, there are more options for changing your home screen’s appearance, including switching between a light and a dark interface mode and choosing from a list of available screensavers.