Media/Loop Browser/Category/Drum&Perc/Midi Loops - who plays?

In Cubase 13 Elements there is 80 midi drum loops in Loop Browser.
They are simple thus usable for jamming.
I can get the loops playing.
I would like to switch the drum kits using Groove Agent and Halion.
Currently there is some instrument playing these loops.

I wonder where you define the instrument and program which reviews these loops?
Also I can see their sound appearing at mixer output channel but there is no individual channel for them visible. Or is there?