2. In the setting menu, find and click "Display and Brightness".
3. In the "Display and Brightness" menu, turn off "Dark Mode".
4. In addition, if the above method fails, you can also check whether other special modes are turned on, such as silent mode and do not disturb mode. , or check notification settings and information and contact settings to ensure that SMS notifications are not accidentally turned off or set as unimportant notifications. If these methods still can't solve the problem, you can consult more professional OPPO customer service or go to a professional maintenance point for consultation. Because this does not support direct setting. So you can try to download related global theme applications to achieve the desired effect.