To highlight the selected text or screen content to be spoken on your iPhone or iPad, you can turn on Highlight Content (or Highlight Words). For detailed operation, keep on reading.
Step 1: Enter Settings > General > Accessibility > Speech.
Tip: Access Speak Selection if there is no Speech in the Accessibility settings.
Step 2: Find Highlight Content on the bottom, and tap the switch to turn it on.
Tip: In some iOS, there is Highlight Words instead of Highlight Content in the settings, so turn on Highlight Words, as exhibited in the following screen shot.
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