Topics are managed as a tree-structure from the table of contents. A topic can contain any number of children topics which itself can contain any number of children topics and so on. Also topics are not sorted in any way in the table of contents so they can freely be positioned. To move a topic in the table of contents:

• Select the topic then from the "Home" ribbon tab, choose one of the move topic action: move up, move down, move left, move right
• Right click on the topic to move then from "Move topic" menu item, choose one of the action
• Drag and drop the topic to the desired position by clicking and holding it, moving the mouse, then release the mouse button where needed

Note: The project topic can't be move. It is always the root of all the topics available in the project.

See the How to move topics in HelpNDoc step-by-step guide.