As I understand, you are looking for a way to print the Block Parameters dialog box of a masked system in Simulink. Unfortunately, there is no way to print the dialog box. The only workaround I can think of is using the snipping tool to get the image, and then convert that image to PDF format.
However, if you are looking to print a specific system in the model, you can refer the following link for more information on how to do the same:
