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I am using pdflatex to create a rather long document. The document also has a table of contents, and the PDF naturally has some metadata of this list of contents that I can view in my PDF viewer (here: Apple Preview and Skim on OS X). The list of contents is collapsed by default, but people on the Skim mailing list told me, that this is a setting inside of the PDF. So how can I tell pdflatex to create an expanded list of contents then?

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I think you are not talking about the table of contents but the bookmarks, aka outlines, of the PDF. Adobe Reader for examples shows these bookmarks at a side bar. Is this correct? – Schweinebacke Nov 20 '11 at 11:21
Yes, I guess this is correct. I don't know the exact names of this. But the side bar basically shows me the table of contents. – Arne Nov 20 '11 at 11:29
The exact name would be "outlines" (AFAIK used at the primary pdf documentation). But almost everybody use "bookmarks". And the tex.stackexchange tag is "{bookmarks}" too. BTW: In German the translation is "Lesezeichen". Unfortunatly "Lesezeichen" has been used for several other elements (e.g. annotations or marks to favorites). – Schweinebacke Nov 20 '11 at 11:41
up vote 13 down vote accepted

This is not a pdflatex issue. You must be using, directly or indirectly, the hyperref package, which controls the PDF TOC. To have it unfolded, just add this to the preamble of your document:

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Maybe you could write a sentence about bookmarkopenlevel=<number> and e.g. link to package bookmark that supports additional bookmark features. – Schweinebacke Nov 20 '11 at 11:17
Perfect. That was what I was looking for! – Arne Nov 20 '11 at 11:30
This solution does not work for OSX Preview, which keeps collapsing the TOC in the left hand pane. – cryptic0 Feb 24 '13 at 21:44

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