With ColorOS 7, the sound comes to Oppo's smartphones when taking a screenshot, but if you don't want the screenshot sound, you can disable it in the sound and vibration settings.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Enable or Disable  Screenshot sound
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Enable or Disable Screenshot sound

Oppo Instructions
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