Hey Kunal,
I think you are trying to disable the Simulink Editor to prevent users from modifying Simulink models.
Refer to these following documentation pages for disabling context menu options:
Have a look at the following MATLAB Answer case for disbaling Simulink toolstrip:
You may also lock custom libraries as well:
For protecting your models and adding a layer of abstraction, you may do the following:
I hope one of these ways would help you out.
