Yeah Doepfer is sort of great when getting into modular and sort of not so great at the same time. They are as true "modular" as you get, I think they pretty much invented it, and their modules tend to be on the technical side. Their instructions are always available but sometimes not the most readable/approachable. I've typically found their UI layouts, while always clean and consistent, to be on the needlessly unintuitive side in some cases.
Beyond that I've found with ADSRs in general that the LED indicators tend to often not behave entirely as I would expect, nor in fact the ADSRs themselves. I've found the Doepfer ADSR I have to be particularly, mm... uncooperative for my purposes, maybe we could say? ... and I prefer my dual Soundforce ADSR. But I've found ADSRs in modular generally to be a much different animal than they were in the digital applications I'd always used before -- way more sensitive and particular, often with what seem to be threshold points where a tiny millimeter of a dial turn will suddenly make a big difference to the sound even though the previous quarter-of-a-dial seemed to barely do a thing. That's often the frustrating thing for me, feeling like my "workable" area in each ADSR always falls into a very tiny range of the dial or knob. Those and EGs have definitely been a learning process for me as I've gotten into this hobby. That said when used creatively they've been a great tool ... but I don't always use them in the same straightforward ways I would in digital applications.
Anyway, all the advice already provided covers it pretty well, just empathizing with the struggle I guess.