Notification volume is controlled by Media volume on stock MIUI11


Dec 21, 2019

Model: Xiaomi Redmi Note 8 Pro 6/128
MIUI: Global 11.0.2, Stable(, PGGEUXM)
Android: 9 PPR1.180610.011

Why would Note 8 Pro's notification volume is controlled by media volume?
For example, when notification received from Facebook or such, its sound is muted or when trying choose a notification sound in settings it shows toast "Ringer is silenced".
When media volume is increased everything works, but this will play from videos or music player with sound through speakers which is not what is needed!
Current volume settings:

Is that a bug?! If so, how to remove that then? All updates are installed and phone was bought less than a week ago.
How would it be possible to separate them? What then these volume bars mean?!

Thank you