Old screenshots.
Customisable dashboard with either custom components, or configured list views.
Multi-level tree for easy navigation.
Node editor with a single Textbox editor, and a many-to-many relation with configurable data views (the All and Countries with 1234 tabs), and easy editing of related entity.
Easy entity picking to relate entities to other entities.
Easy collection nesting (even recursive).
Out of the box validation support via validation attributes, on all editors.
Totally configurable authentication (since nothing is provided out of the box), so it's possible to have authentication based on Identity, or use something like Azure AD.
Data views can be generated dynamically, so next to having fixed, hard-coded data views,
generate the required tabs using a DataViewBuilder.
So its possible to put lists inside your list, and if you want, go even deeper than that. This screenshots displays a ListEditor, table style, incorporated inside a ListEditor block style. It does tend to become a bit crowded, but determining how far you want to go is totally up to you.