If Wi-Fi+ is activated on your Huawei smartphone, your device will connect automatically to another network, if your actual connection is too bad. If all Wi-Fi networks are weak, the device will connect to the mobile data network if mobile data is activated, to keep the device online.

Android 10 | EMUI 10.0
Wi-Fi+ on/off -  Open the  settings
Wi-Fi+ on/off -  Tap on  Wi-Fi
Wi-Fi+ on/off -  Open the  menu
Wi-Fi+ on/off -  Tap on  Wi-Fi+
Wi-Fi+ on/off -  Activate or deactivate  Wi-Fi+
  1. Open the settings
  2. Tap on Wi-Fi
  3. Open the menu
  4. Tap on Wi-Fi+
  5. Activate or deactivate Wi-Fi+

Huawei Instructions