Fluidsynth and couple of other engines missing in "add instrument chain" list

ok got it, i have to left click on “category” and hold it, then moove the mouse up or down to scroll thru the categorys.

FluidSynth is on Category 2. and there are 6 more categorys - nice!

ok thx now i know more… was not obvios for me,learnd zynthian a bit.