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Oppo calls it "Eye comfort", it is better known as night mode. The blue light filter is easy on the eyes in dark environments. Blue light can be filtered out and the intensity can be adjusted.

In addition to manual activation/deactivation, a schedule can also be configured.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Display & brightness
Step 3: Enable or disable  Eye comfort
  1. Tap on Settings
  2. Tap on Display & brightness
  3. Enable or disable Eye comfort
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Oppo Instructions