Open Settings > Display Tab > Home Screen.
Choose which folder to select a wallpaper.
Select an image.
Resize the image, then tap OK to set.
Note: You will be prompted to set wallpaper to lockscreen, this is optional.
Open Settings > Display Tab > Theme.
Select a theme from the list to preview.
Tap Apply to set.
Note: You can download new themes for your LG V30 from the Theme settings but will be prompted to download LG SmartWorld.
Open Settings > Display Tab > Home screen.
Tap Select Home.
Select the type of home screen you want to use from the list.
Note: Downloaded 3rd party home screens can be selected from this settings as well.