Use this code example to change the line break of CSV to '|'. It will prevent paragraphs fields (and other fields that may have line breaks in them) from being fragmented when being imported as an .csv file.

add_filter( 'frm_export_csv_line_break', 'change_csv_line_break');
function change_csv_line_break( $line_break ) {
	return '|';
}