Originally Posted by LupineChemist

While DBV will leave from T4 main, you actually will do transit security in T4S and will have lounge access to the superior T4S lounge. There will be an S "gate" assigned that is just a bus that will take you to the T4 gate so you won't actually have to enter Schengen.

If you want, you can enter Schengen and then leave again at the H gates and use the Dalí lounge, but I'd recommend staying in T4S.