Hi Graham, and thanks so much for replying. Please excuse the quality of the image I show you here — a quick snap with my cell phone has a lot of moire (just ignore the moire), but it shows you very clearly what I see — and what I do not see.

As you can see I do not even have the option of choosing from various devices — that part of the window is simply blank.
I found a much older post…I think dated from 2013, from a gentleman who had the exact same problem. He even posted an image identical to what you see. Someone chatted with him about it but the thread simply ended and no final solution was posted.