Simple Dark is one of most beautiful and clear theme for LG G5 V20 Oreo. You can apply the theme by going to settings, themes and selecting this theme from the selections available!
Some antivirus applications may warn you wrong because overlay apk files include in theme.

Note: Do uninstall and reinstall theme instead of update. If you do update maybe hang on preparing or notify not enough space happen, please reboot and apply theme again.

Hope you enjoy it! Any problems and feedback please email me with screenshots, not leave a bad comment:

Email : thanhbinh10692@gmail.com