Exporting project to PDF..

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From Scrivener’s Help: Compiling the Draft:

Keep Format: If this is checked, the document does not take on the text formatting defined in the Formatting pane (below), but preserves the way it looks in Scrivener’s editor. This is useful for chunks of text that require special formatting, such as letters or title pages. The same as “Preserve Formatting” in the inspector.

There’s also a bit on Import/Export in the official FAQ