Information about the activity section coming soon(tm)
Activity -> Options -> Show Unknown to view all downloads including those that could not be matched within the application's category. See TRaSH's Guide for more details
The queue shows all items the application can recognize that is in the specified download client's category (Settings -> Download Client -> Category). To view all releases Options -> Show Unknown. This is not stored anywhere within the application, but is updated via your Download Client's API responses.
More information about the Queue section coming soon(tm)
Information about the History section coming soon(tm)
Information about the Blacklist section coming soon(tm)