Tried that but got "no match" in the minibuffer. Should I just set it in my
.emacs file? What value should I set it to? Thanks.

peter360 writes:

Try doing M-x man first (you don't have to get past the minibuffer
prompt). This will load up the lazy-loaded libraries and define
Man-notify-method for you.

Then you'll get completion (and a list of possible values) for M-x
customize-variable. (Because defcustom/defvar don't clobber existing
values, the setting from this will work in future, even though it gets
read at emacs load, before man load)

Rupert