On the Oppo smartphone, Google speech input is installed and enabled by default, but if speech input is not desired, it can be disabled under ColorOS in the preferences.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Keyboard & input method
Step 4:  Tap on  Manage keyboards
Step 5:  Enable or Disable  Google voice typing
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Keyboard & input method
  4. Tap on Manage keyboards
  5. Enable or Disable Google voice typing

Oppo Instructions
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