• 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 style: Formatting applied to a heading. Microsoft Word has nine different built-in styles: Heading 1 through Heading 9.) (Heading 1 through Heading 9) or outline-level (outline level: Paragraph formatting you can use to assign a hierarchical level (Level 1 through Level 9) to paragraphs in your document. For example, after you assign outline levels, you can work with the document in outline view or in the Document Map.) 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 (table: One or more rows of cells commonly used to display numbers and other items for quick reference and analysis. Items in a table are organized into rows and columns.) or one or more text boxes (text box: A movable, resizable container for text or graphics. Use text boxes to position several blocks of text on a page or to give text a different orientation from other text in the document.) 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 (frames page: A Web page that divides a Web browser window into different scrollable areas that can independently display several Web pages. One window can remain unchanged, while the other windows change based on hyperlinks that the user selects.), you must display the Document Map in a separate window. You can display the Document Map for the active frame only.

When a document contains a frames page (frames page: A Web page that divides a Web browser window into different scrollable areas that can independently display several Web pages. One window can remain unchanged, while the other windows change based on hyperlinks that the user selects.), 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.

If a picture bullet (bullet: A dot or other symbol that is placed before text, such as items in a list, to add emphasis.) 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.

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.