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the way content is displayed is managed by templates which are stored in the XOOPS database. This means that you don't need to edit any physical files to change this.
In your system admin panel, go to Template Manager. The default template set is not editable, this is to have something to revert to if your own template fails to render correctly. To change the way the content is shown, clone the default template set, and edit the news templates of the cloned set.
Good luck!
Herko