While the Preview Pane allows you to quickly see a preview of the document you have selected, you can also open a document and maximise it on your screen.
For more information on how to set your document’s double-click option, see Setting your Preferences.
To open a document to fill the windows:
Double-click the document link.
The document opens in a maximised view mode and fills the entire area of the search results and Preview Pane.
To minimise the view of a document you are viewing in full-screen mode, simply click the Restore down button. The split screen window is restored, and the document you have open displays in the Preview Pane.