You can change the local Z axis orientation of a plate element. For that, select the plate element > Go to Commands > geometric constants > Plate reference point. Specify the co-ordinate towards which (or away from which) you want to point the local Z axis.
Local X and Y axis orientation depends on - in which order you have selected the corner nodes. So to change the X and Y axis orientation, you need to recreate the plate.
Local X and Y axis orientation depends on - in which order you have selected the corner nodes. So to change the X and Y axis orientation, you need to recreate the plate.