The options -Ddefault_featured_apps & -Dhardcoded_curated install /usr/share/swcatalog/xml/org.gnome.Software.Curated.xml & /usr/share/swcatalog/xml/org.gnome.Software.Featured.xml
I am assuming that these are the catalog that gnome-software will show on the main screen (correct me if its not) because Its not showing things in that way.