Why does the Xiaomi smartphone fail to enable Dark mode?

If the Xiaomi smartphone fails to enable Dark mode, please refer to the following steps to troubleshoot:
1. Check if a third-party theme is being used. You can try switching to the default theme to see if Dark mode becomes available.
2. Check if only a specific app is unable to enable Dark mode. It is recommended to enable the relevant settings within that specific app.
3. Try restarting the phone to fix temporary system issues, clear background errors, and restore normal system performance and feature functionality.
4. Please check if your phone has the latest version and update it to the latest version to see if the problem persists.
5. If none of the above works, please provide feedback and submit the log in the Settings promptly.