What you're displaying is the filepath for a heading entry in a Table of Contents. It is not a hyperlink, as such. It also isn't apparent why you'd want to remove that but, if you don't want to see it, select the Table of Contents, press Shift-F9 to expose the field code - which will look something like {TOC \h} - then delete the \h and press F9 to update.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]