Eli Zaretskii writes:

>> From: ams@gnu.org (Alfred M. Szmidt)
>> Date: Tue, 08 Sep 2020 12:22:30 -0400
>> Cc: justin@burkett.cc, emacs-devel@gnu.org
>> 
>>    PS. I personally think it should be enabled by default, but we would
>>        probably do better to first include it as an option for people to
>>        get more experience with it.
>> 
>> Could the output be improved though?  The current output is VERY
>> verbose, and quite bare and unexplanatory.  On my terminal it takes up
>> 9 lines when just hitting C-x.  It also dislikes any type of prefix
>> command and hides the output from those.  E.g, C-h, M-o etc, where it
>> eats the message from the original command.
>

The height can be adjusted using `which-key-side-window-max-height' or
`which-key-frame-max-height', depending on which `which-key-popup-type'
you use.

>
> Btw, did you figure out how to scroll to the next page?  In
> particular, after typing "C-h" that shows the first page of Help
> commands?

Pagination is done by hitting C-h C-n and C-h C-p, or C-h n and C-h p
when the which-key popup is active.