Sometimes I have multiple open frames (not only windows) in Spacemacs, and would like to collapse all frames into one single frame. That's easier to keep track on open buffers.
However, I cant' find a way to collapse all frames into one. I'm aware that I can kill open frames, but that's not what I want.
How can I collapse all open frames into one single frame in Spacemacs (or Emacs)?
EDIT: To clarify, what I want, please consider the following images.
What I have:
Multiple Windows appear in multiple frames.
What I WANT:
I would like to collect all windows within one frame. That is, whereas before the $n$ windows were spread across $k$ frames, now I want to have the $n$ windows within one frame.
Of course, I could delete all other frames, and then reopen the windows in my main, single, remaining frame. But I do not reopen all the windows again. Rather, I'm looking for a key binding that changes from "what I have" to "what I want"
(2nd question deleted as asked by Editor)