Increase volume on center channel when downmix?

Hello everybody,

This is my first post here and I would like to thank you for the good software.

I am using Libreelec for some time, first with RPi2, now with Odroid C2.
WIth the Odroid and Libreelec 8.0.2 I noticed a missing option in settings - "increase volume on center chanell when downmix", it is just not there.

With RPI2 the function was there and working.

Is it a Odroid build thing or it is something else, and can I get the option back. I live in a flat and it is important for me.

Thanks again and good day.