User blog comment:Mira Laime/Introducing long-awaited Discussions updates/@comment-35205453-20190401194722/@comment-26339491-20190401204843

We're not planning on deleting any main pages. The new combined Feed is just an additional landing page options users can go to instead.

As for the background image: It is pulled from the image the community set in the ThemeDesigner. Perhaps yours is hard-coded instead and therefore doesn't show up in the new Feed?