ispell-help-in-bufferp

ispell-help-in-bufferp is a variable defined in `ispell.el'.
Its value is

nil

Documentation:
Non-nil means display interactive keymap help in a buffer.
The following values are supported:
nil Expand the minibuffer and display a short help message
there for a couple of seconds.
t Pop up a new buffer and display a short help message there
for a couple of seconds.
electric Pop up a new buffer and display a long help message there.
User can browse and then exit the help mode.

You can customize this variable.