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For views that have numerous documents organized under numerous categories, use the View -> Expand/Collapse options to expand or collapse the categories or subcategories you want.
If you open a document in a view, and then accidentally close the view, you can open the view without closing the document by clicking View -> Go up to Parent View.
To show or hide the preview pane, from the menu click View -> Preview Pane and then check or uncheck Show Preview.