How to turn power saving mode on and off on my Huawei Nova Plus

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Power saving mode (extended standby mode) optimizes battery life on your Huawei Nova Plus. When the screen is off, your phone will save power by lowering the screen brightness, turning off haptic feedback and limiting the phone's performance. You will still receive messages and notifications.
1. Touch Settings.
2. Scroll to and touch Advanced settings.
3. Touch Battery manager.
4. Touch Power plan.
5. Touch Ultra to limit the phone to using only calls, messages and contacts.

Performance is used for gaming or watching videos. Smart is for daily use.
6. Touch the Checkmark icon.
7. Read the warning and touch Enable.
8. Power saving mode is now on. Touch Exit to turn off the power saving mode.