screen goes black during phone call

[diskwzrd]

I have an LG V30 which keeps dimming/shutting down the display when I am on calls. None of the above settings exist on the menu. Any suggestions?

 

[Yirg]

This app solved the problem for me:

https://play.google.com/store/apps/details?id=com.synetics.stay.alive&hl=en