An oft asked question.
Think about an old fashioned flight deck with a great big control wheel on top of a heavy control column. Now think of the higher paid guy or gal in the Left seat. He or she wants to change a radio frequency, set up a change on the autopilot or adjust any control on the central console.
Now which hand is he or she using on the old fashioned control column?
You got it, the southpaw pilot!
So just the same on a nice new flight deck with siestick controllers where the pilots have a table for paperwork, for the in-flight snack if needed, for the lap-top. And with side-stick, for the first time, lady pilots can wear a skirt if they so wish!