Manage Repositories Button - VirtualEnv vs. PipEnv

I am new-ish to PyCharm, and I have a question regarding the Manage Repositories button. Is there a reason why the Manage Repositories button is available if I set up an interpreter using VirtualEnv, but it's not available if I set up an interpreter using PipEnv? I'd like to use both PyPi and an on-prem Artifactory repository, and I find it easier to deal with PipEnv in a Team City build step than VirtualEnv. Is this by design or am I just missing something?

Regards,

Bruber