After recognizing a document in FRE, instead of a carriage return (marked in yellow), there is a manual line break (marked in red). As a result, it is harder to edit a recognized document.
The issue is most likely caused by the Property KeepLines = true of the RTFExportParams Object used in your application.
It can be used to retain original lines in recognized text. Please note that by default this property is set to FALSE.
To resolve the issue, you should either set the KeepLines property to false, or leave it with default value.