My component has gone missing!

Related to this post:

I have a button group button_group_map that exists, but is nowhere to be found. I don't want to delete it - instead I need it to be seen and used. Alas, I haven't any idea where the dog-gone thing has gone!

Can I find this renegade component and bring him home?

Here is the left sidebar info:
image

And here is the screen on which he's supposed to be living:

I still need to know how to do this, but it's less urgent since the prodigal son has come home:

(No clue how this happened. I was on another tab fighting with something else and when I came back here poof it was back!)

Usually refreshing will fix this, in my experience

Ah - I might have refreshed for some other reason and gotten the poof upon that!

Thanks @byron!