Argument checkbox missing from model workspace

I have a project that requires concurrent execution. Because of this I must use referenced models. I manually created referenced models that replaced the existing set of subsystems. I went through the process of setting up the masks and matching those parameters to the ‘Simulink Parameters’ configured via the model workspace. However, the menu options I observe do not match the documentation available online. Specifically, I do not see a checkbox for ‘Argument’. I see a column for ‘Argument’ but it is always empty and not editable. Has this menu been updated in Matlab 2017 but not re-documented?

Also, it seems plausible that rather than checking the ‘Argument’ box, I would place the parameter name in the field for ‘Model arguments (for referencing this model)’ to produce equivalent behavior. Please confirm.