In MS Word it is possible to show the document structure on the left side?
Is it possible to remove the figures/tables from that list (and keep only the paragraph captions)?
I'm using Word 2007.
I believe you mean "Document map" which can be found under View as seen below.
When I tried it the headings appeared in the map, but things like tables or captions did not.
Perhaps what has happened is those caption paragraphs have had their styles modified so that the Paragraph Format -> Outline Level is set to Level 1 to Level 9. This will cause them to appear in the map. If you modify the outline level back to Body Text they will not longer appear in the map.