When I creating subsystem mask, the parameter option disapear.

How to solve this situation?

Answer 1

[Sanman]

Hi,

I believe what you're trying to mask here is a model block. For a system mask(mask on a model reference), the parameters tab does not exist, and you can add/remove parameters to the system mask using model arguments.

Please refer to the following documentation on how to add parameters to system mask.

https://www.mathworks.com/help/simulink/ug/create-and-reference-a-masked-model.html

Hope this helps!