If several WLAN networks already connected are within range, the Oppo-Smartphone itself decides which one to use, but the automatic switch between the WLAN networks can also be deactivated.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Wi-Fi
Step 3:  Tap on  Wi-Fi Assistant
Step 4:  Enable or Disable  Auto select the best Wi-Fi
  1. Open the Settings
  2. Tap on Wi-Fi
  3. Tap on Wi-Fi Assistant
  4. Enable or Disable Auto select the best Wi-Fi

Oppo Instructions
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