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How does Xiaomi 4 close the system prompt?

Xiaomi 4 mobile phone off system prompt tone:

1. Open the MIUI system setup page, and click the menu item "Sound and Vibration" on the setup page.

2. Next, in the page that opens, select the options of "Calendar ringtone" and "SMS and notification ringtone".

3. Next, adjust all the settings to the "no bell" state.