NoteWorthy simply and flatly has a bug in it's handling of the "orchestral" staff property. It puts a heavy accent from the top to the bottom of the system if any staff has the orchestral property and a finial only on the top or bottom staff and then only if that staff is flagged orchestral.
The correct behavior is to put a heavy accent on and only on each staff that is orchestral, and put a top finial at the join between an accented staff and an unaccented or nonexistant staff above and a bottom finial at the join between an accented staff and an unaccented or nonexistant staff below. The only way I have found to get around this problem is to print pages, scan them, and paste in the accents and finials graphically.
This one problem alone makes NoteWorthy nearly useless as a serious printing program, despite all the added prettyness from version 1, and is listed as fixed in version 2. So where is the fix?
Please see my reply to your duplicate post:
https://forum.noteworthycomposer.com/?topic=1452.msg40779#msg40779
We could continue the discussion under "break barlines", but this subject heading directly names the problem.