Many devices now have a system-wide dark mode (dark design). Despite this, the Chrome browser is always displayed in the light design by default. In the settings, the dark design can be selected, but also the design of the system settings.

Android 9 | LG UX 9.0
Dark Mode -  Open the  Chrome  Browser
Dark Mode -  Open the  Menu
Dark Mode -  Open the  Settings
Dark Mode -  Tap on  Themes
Dark Mode -  Choose between  System default ,  Light  and  Dark
  1. Open the Chrome Browser
  2. Open the Menu
  3. Open the Settings
  4. Tap on Themes
  5. Choose between System default, Light and Dark

LG Instructions