The purple tag is a bookmark. It means that the book has been opened but not finished. Adding the bookmark above is one of the ways to cause this.
I've never found a way to close the book. It should be whatever kepub you read last on whatever device or Kobo app you used. If you open a kepub on the and the reading position gets synced to the server, this should get picked up by the desktop app the next time it syncs..
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