📄️ Header and Footer
To add or remove content in the Header and the Footer, chose Structure > Block Layouts (/admin/structure/block).
📄️ Page Layouts
Modifying the Layout
📄️ Article Layouts
Managing the article layouts is almost the same as managing page layout. The only difference is that the changes you've made with the IPE (In-Place Editor) will only be applied to that article, instead on all articles that shares the same layout.