I am looking for configuration that displays the minibuffer in which to type input above matching candidates in a helm buffer.
I went through each helm variable and the closest named variable was helm-display-source-at-screen-top but it doesn't do what I am looking for.
Thanks,
FWIW, there is a near comprehensive helm manual in Helm Manuals. I happened to discover this URL accidentally while searching through the issues page of helm.
Try
helm-exchange-minibuffer-and-header-line which is bound to C-c %. That command temporarily toggles the user option helm-echo-input-in-header-line
No, Emacs is somewhat inflexible in this regard. See other questions such as is it possible to move the emacs minibuffer to the top of the screen?. Pretty much all you can do is move the minibuffer to its own frame, and then position that frame and other frames how you want.
What you want is (setq helm-echo-input-in-header-line t).
