Ansoft maxwell 15, parameters-assign-matrix option disappear

[MMCTEM]

I am learning to use software to do some simple simulation. It seems that the Maxwell 2D/3D-parameters-assign-matrix option disappears sometimes. Under the menu of Mawell 2D-Parameters-Assign, only Force and Torque can be seen. In what cases the Matrix option is visible? What should I do if I need to use this option but can't see it? Thank you very much !

 

[Illmatic1]

The Matrix option under the Maxwell 2D/3D-Parameters-Assign menu is usually only available when you are assigning parameters to a matrix. If you need to use this option but can't see it, you may need to select the matrix element in the structure tree before opening the Parameters Assign window. Once you have the matrix element selected, the Matrix option should appear.