Mutt hides full headers and i cannot see how to get full header information for emails

i am running what seems to be Mutt 1.9.4 (2018-02-28). And the problem is that I cannot obtain full header information for incoming emails. the h just provides an additional Mime-Version: 1.0 and messageID (if it includes cc participants). I have tried to play around with the muttrc configurations, but none of the obvious things works. any ideas?