note: in certain states you have to have a railing extend a
certain distance beyond the last step.
i haven't checked lately but it used to be
12" extended beyond.
it is a safety issue.
you can cantilever the end of railing beyond the post.
it's called rails "OVERHANG ENDS"
edit the stairs and go into the "RAILs" tab
put the dimension for the overhang in the "OVERHANG ENDS" box.
TIP: the post has to be SHORTER than the rail.
if it's not shorter, the rail will stop at the post.
tried it on an interior stair rail as in photo.
not sure if it works on a deck railing.
click to enlarge rendering