"Read in background" is an experimental function of "Select to Speak". the voice output is usually only as long as the text is visible. if "Read in background" is activated, for example, a longer text can be read aloud, even if we have already called another app. experimental means, however, that this does not always work.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Accessibility
Step 4:  Tap on  Select to Speak
Step 5:  Open the  Settings
Step 6:  Enable or Disable  Read in background
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Accessibility
  4. Tap on Select to Speak
  5. Open the Settings
  6. Enable or Disable Read in background

Oppo Instructions
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