Get that manual out and check it.....all appliances are different. I have top of the line
double Dacor ovens, put in when we updated our kitchen fourteen years ago, I have never used the convection feature. No reason particularly except I never saw a reason to do it. When the oven was demonstrated to me, the salesman put in five oven racks full of cookies, and cooked them with convection. I was amazed at the time.