Originally Posted by warpdryv

in J - front of the seat near the floor, below the arm rest. pull on the latch and the whole arm rest sinks down to the level of the seat.

in Y - the underside of the armrest at where it hinges to the seat there is a latch you can push or pull - i don't remember, and then the arm rest will swing back to match the seatback.

makes it much more comfortable for entry & exit, and also for "people of size".