Originally Posted by
MichielR
I checked again on departure today. Indeed, normally arriving at the A gates and the B gates, you can just go up the stairs. Arriving C or F(rance) and sometimes A or B bus, this will involve a security check.
The signage is pretty good I also noticed today.
Just follow the transfer and up the stairs as mentioned by
MichielR. See picture below
Once upstairs if you keep walking towards the Duty Free shop the stairs to the SEN/Biz lounge is on the left.