Change Mopidy's volume

I have mopidy, bluetooth a2dp and spotifiy connect running on a pi. They are the source for snapserver to cast the audio to the network. While bluetooth and spotify seem to have the same volume range, mopidy is really loud. I dont want to change snapserver volume because it is working for two sources.
Is there a way to adjust mopidy’s volume in this setup? Thank you!

Did you check the mixer_volume setting:

Is it the volume range you want to adjust? Otherwise changing the volume is just a case of… changing the volume! What am I missing?

It’s the range I want to change. I’m currently using only the lower 5-10% of the volume slider since everything above is way too loud.