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The Document Map doesn't display some or all of the document's headings.
Microsoft Word may not be able to identify headings in the document When you display the Document Map, it shows any headings that are formatted with the built-in heading styles (Heading 1 through Heading 9) or outline-level paragraph formats (Level 1 through Level 9).
If Word can't find any headings formatted with the heading styles or outline levels, it automatically searches the document for paragraphs that look like headings (for example, short lines with a larger font size). Then Word applies an outline level to these headings and displays them in the Document Map. If Word can't find any such headings, the Document Map is blank.
Headings may be in a table or text box When you display the Document Map in a document that contains only a table or one or more text boxes with heading rows or heading styles, the heading rows or styles do not appear in the Document Map.
You may have switched to another view When you display the Document Map, it is available only for the view you're currently in. If you switch to another view, you need to click Document Map 
on the Standard toolbar to display the Document Map for that view.
You may have added a frames page When your document contains a frames page, you must display the Document Map in a separate window. You can display the Document Map for the active frame only.
The Document Map doesn't open next to my frames.
When a document contains a frames page, the Document Map appears in a separate window for the active frame only. To show the Document Map for another frame in the frames page, display the document that contains the frames page, click the frame you want to show the Document Map for, and then click Document Map
on the Standard toolbar.
Picture bullets applied to headings do not display in the Document Map.
If a picture bullet is applied to a heading, the picture bullet will not display in the Document Map. Instead, you'll see a minus sign (-) next to the heading in the Document Map. To show bullets in the Document Map, you must use text bullets.
I resized the Document Map, but it returned to its original width.
You may have closed and reopened the document The Document Map keeps a custom width setting until you close the document. When you reopen the document, Microsoft Word automatically sets the Document Map to one-fourth the width of the window.