How to turn down the notification tone of Xiaomi k40?

First, we slide the screen left and right on the mobile phone and find the "Settings" icon of Xiaomi mobile phone.

Next, on the Xiaomi mobile phone settings page that opens, we click the setting item of "More Settings".

At this time, more settings pages will pop up, and we will click the menu item "Accessibility".

In the auxiliary setting page that opened, we found the setting item of "mono audio".

Then you need to click Open Settings on the phone screen, then click Open Sound in the settings interface, then find ringtones and reminders in the sound interface and click Enter, and finally drag the volume slider below it left and right to raise or lower the volume.