Why is the "Code Interface" button not available to me under c++ code tab

I am trying to follow the documentation for tweaking my generated code class here:

https://www.mathworks.com/help/ecoder/ug/interactively-configure-cpp-interface.html#mw_490de96d-a6fc-4212-bea7-a52155eb6962

The documentation shows that I should have a "Code Interface" button as a third option in the "Prepare" category. All that is present to me is "C/C++ Code Advisor and Settings".

The documentation link is for R2021a and I am using R2021a. I also have embedded coder licenses because I am able to generate code.

How do I get this button to show up? The Documentation makes it seem pretty essential

[Aayush Jain]

Hey! Looking at the documention page, this does seem out of order. Would you be able to share the steps you took to reach this state of the User Interface?