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Starting with ColorOS 7 the Intelligent Sidebar (formerly Smart Sidebar) offers the possibility to set the transparency of the bar.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Convenience tools
Step 3: Tap on  Smart Sidebar
Step 4: Set the  Floating bar opacity
  1. Tap on Settings
  2. Tap on Convenience tools
  3. Tap on Smart Sidebar
  4. Set the Floating bar opacity
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Oppo Instructions