Header image for post section

I would like to change the header image of the post section:

https://www.bauernhof-bartel.de/aktuelles/

But Brasserie only uses the main header image from the start page, which I can change in the customizer. If I change the post picture, nothing happens. I try this under “Edit page” (where it says: “You are currently editing the page that shows your last posts”).

Please, can you help me?

The page I need help with: [log in to see the link]