I think it would be useful to be able to reorder "chapters" through drag & drop in the "Table of Contents" section in the right sidebar.

Dragging a specific heading would move that heading and all blocks immediately below it up to and excluding the next heading of the same level.

Dragging headings could also change their level, depending on where you drag them to.

Let's go through a quick example of how I think this could work.

• A "chapter" is the heading block that was selected, and all blocks immediately following up to and excluding the next heading of the same level or up to the end of the document.
• If the author drags the entry "H2 The Inserter Tool" entry below the "H2 Media Rich" entry, the "H2 The Inserter Tool" chapter gets moved below the "H2 Media Rich" chapter and is the last chapter in the document from then on.
• If the author drags the entry "H3 Sub-heading A" on top of the "H2 The Inserter Tool", the chapter "H3 Sub-heading A" moves from being a sub-chapter of "H2 Visual Editing" to being a sub-chapter of "H2 The Inserter Tool".
• If the author drags the entry "H3 Sub-heading B" between the entries "H2 The Inserter Tool" and "H2 Visual Editing", the chapter "H3 Sub-heading B" gets moved in-between these two chapters and changes its level to "H2 Sub-heading B".

This would make re-ordering the structure of a larger document much faster and easier (no need to scroll around over multiple pages of content) and less error-prone (like copy-pasting only partial chapters).