..with the centreline between your legs, from either seat, you will be on the line
RAT 5's recommendation could provide a clue - when you learnt to fly, were you taught to keep the centreline under your right leg to maintain it? Students taught this pre-solo sitting in the right-hand seat of a single-engine trainer find that a move to the right-hand seat in a larger aircraft requires an adjustment to the technique (and no, I'm not suggesting you attempt to land with the centreline under your right leg now, only that you might not have been given a new 'rule of thumb' for the datum during type training).