Analysis Results > Shell Forces, Moments & Stresses > Shell Principal Forces & Moments displays the following dialog.
It allows you to view shell principal forces and moments for each load combination. The shell principal forces and moments include in-plane principal forces Fmax, Fmin and the principal angle F-angle; out-of-plane principal moments Mmax, Mmin and the principal angle M-angle; out-of-plane principal shear force Vmax and the principal angle V-angle. You may specify the principal force and moment locations to be at the nodes and/or the center of each shell by running Settings & Tools > Data Options. You have the option to view the principal forces and moments for the selected shells only.