How to set the prompt tone for mate20pro to hang up the phone?

Go to Settings-Applications and Services-Application Management-Contacts-Notification Management-Sound Reminder-Notification Ringtone-Select No Ringtone.

Suddenly, I will receive a notice and hear a tone. Because Mate40' s receiver is also a speaker, suddenly the treble is almost deaf. Can it be modified to not block the notification tone within 2 seconds after hanging up the phone?

The design of Mate20Pro, although many people thought that the Yuba camera used in the machine was ugly at that time, had to admit that it was highly recognizable.