Additional tabs, or “page-parts”, like the “sidebar” tab (circled in blue, above) can be added by clicking on the green ”+” icon at the top-right of the editing area:
In Wolf CMS, when you create other sibling pages (child pages of a common parent page), the new pages will have the page-parts of the original sibling page auto-created. That is, if “Child1” page has body and sidebar, then further child pages of the same parent page will also have body and sidebar page-parts at creation.
Page-parts are auto-created matching the last page created at the same level.
Pages created as a child of Homepage always have only the body part.