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Hello Bruno,
thank you very much for your patience.

I think I made a mistake connecting somewhere. Maybe you can draw me a schematic?

At the moment I soldered the red cable from the servo back to the circuit board (at the V) of the light barrier. In front the 3er plug goes from the V to 5V+.

I soldered the brown cable from the servo to the back of the G and go to Ground with it at the front.

So I still have two cables left. The sensor cable from the light barrier and a control cable from the servo. The sensor cable goes into the left connector of the mainboard of the Z-barrier. The servo cable to the red wire of the display (should be pin 27, because the beep has stopped).

I've already made several attempts to connect the whole thing. If I connect the servo separately (with plus e.g. to another Arduino), it won't move at all. If I then connect Ground from this Arduino to the mainboard, the servo stutters again.

Unfortunately I only have a 100uF capacitor, but it didn't improve. I soldered it between V and G on the back of the light barrier.

Unfortunately, I don't know much about electrical engineering, so it's very difficult to troubleshoot.
How did you ground your Ender?

Oh well, if I remove the cable from Pin27 (the control cable of the servo), it won't jitter anymore.