The stick in an A330 is on the side of the seat instead of in the middle. Do the pilots fly with their left hand or do they sit in the right-hand seat in these planes?

nope,two side-sticks,so if the pilot is flying(if he is PF) he has to do it with his left hand.not that much differnce I think when you have autotrim+the sticks centers itself always,maintaining the last inputregards,Seba

Considering almost ALL planes are flown using your left hand, it doesn't really bother pilots that much. You're taught to always have your hand on the throttle, or manipulating buttons/gauges etc, with your right hand. Your left hand is on the yoke or control column or control stick.