LG allows a lot of leeway when it comes to personalizing the smartphone, so via the app SmartWorld you can download new designs/themes which will change the system extensively into a new look. In addition to backgrounds (which can still be changed with a new design), the symbols and font can also be adapted.

In the LG SmartWorld Store you can download both free and paid designs.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Wallpaper & theme
Step 4:  Tap on  Theme
Step 5:  Tap on desired  Theme
Step 6:  Tap on  Download
Step 7:  Confirm with  Apply
  1. Open the Settings
  2. Tap on Display
  3. Tap on Wallpaper & theme
  4. Tap on Theme
  5. Tap on desired Theme
  6. Tap on Download
  7. Confirm with Apply

LG Instructions