Greetings!
I am baffled and do not know if my problem is that I cannot find a setting or if the issue is elsewhere … or even if this is an issue at all!
In Roseta, the section titles (category titles, post titles, meta info) are displayed in the header location, on top of the header image.
It looks like you’ve set your header image height to 0, which hides the header image entirely and with it all content that’s part of the same element, including the titles.