low voice during calls in s8

[mullo]

Since I updated dialer or "phone " as it's stated in the galaxy apps icon 
I hav been having this problem of low or much less sound during calls unlike in the past where it was so audible 
Wat cud be the cause ??

[ishimo]

check settings

[mullo]

there is nathing

[mullo]

wic part of settings

[mullo]

Wic settings??