Never able to calibrate in game

Hi I have been zwifting long enough to get to level 26 I have two powermeters a stages and a powertap g3 hub I am on my second smart trainer Elite Zumo, Tack flow I have used zwift on my Windows PC ,Macbook air and Ipad. But I have never had the option to calibrate any of my powermeters or smart trainers in game, Is there a secret I don’t know about?