Hello,
We have a look on your backend, and you haven't edited the right view see my screenshot to understand my point.
For your frontend you use the template
ja_mixstore, and you have made your custom for the
beez3 template
Now, to answer you on the fact that this operation is not "user-friendly".
You must understand that, here, we are on a code customization, so to have something simply "configurable" isn't possible, because it's building code process, by deriving from a view, thus technically making it simpler is not really possible.
And that's why we guide you not only to have what you have to ask but also for you that you master the tools better.
Regards