The library of CAPA problems currently resides in the Contrib directory of webwork-open-problem-library. Those problems have not yet been moved tagged, vetted and moved into the OPL. For now you need a separate Contrib button to access them. The Contrib button is installed using the same instructions as for the old CAPA button and gives you access to all of the contributed problems including CAPA. You may not want to make this available to all instructors or in all courses since all the new possibilities are a bit overwhelming. The Contrib problems cannot be accessed by key words or meta-data from the library -- you have to know exactly the path of
the problem you want.