Why are all the Samplers set to max gain?

When I start Mixxx all the Samplers are set to maximum gain. Is there a way to have them all set to a lower gain each time Mixxx is started up, such as is the case with the Preview which is set to 50% gain?

I use many Samplers for some of my gigs, and having to go to each one and reset its gain every time I start Mixxx, which makes start up not quick and easy. If there is a better way to reset these, please let me know.

I am using the the current versions found here > downloads.mixxx.org/builds/2.1/release/
And I am running Windows 10.

The samplers start with unity gain. It looks like we have that the default Deere skin has no accessible gain knob, the other skins have one.