Tapping and holding the Home button will start the Google Assistant app, and in addition to "OK Google", the Assistant app on the Home button can also be turned off.

Android 9 | LG UX 9.0
Google Assistant from the Home button -  Open the  Settings
Google Assistant from the Home button -  Tap on  General
Google Assistant from the Home button -  Tap on  Apps & notifications
Google Assistant from the Home button -  Tap on  Default apps
Google Assistant from the Home button -  Tap on  Assist & voice input
Google Assistant from the Home button -  Tap on  Assist app
Google Assistant from the Home button -  Tap on  None
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on Default apps
  5. Tap on Assist & voice input
  6. Tap on Assist app
  7. Tap on None

LG Instructions
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