A family of Microsoft word processing software products for creating web, email, and print documents.
To determine the paragraph outline level, put the cursor in one of your caption paragraphs that have been caught in the document map. On the Home ribbon, click the Paragraph group's launcher arrow (lower right). The outline level will say "Level 1", or some such. Change the level to "Body Text" and that caption will disappear from the document map.
Because Word changes the outline levels with direct formatting, you can select a caption paragraph (or all of them at once) and press Ctrl+q to clear the direct paragraph formatting.
Pam