Heading faces for
outline-minor-mode does not change
the appearance of headings to look different from comments.
This package defines the faces
outline-minor-N, which inherit
from the respective
outline-N faces used in
and arranges for them to be used in
(use-package outline-minor-faces :after outline :config (add-hook 'outline-minor-mode-hook 'outline-minor-faces-add-font-lock-keywords))
If you want to only enable these faces in certain major-modes, then add this function to their hooks instead of to the above hook.