I am assuming the screenplay is to become a movie.
When writing a screenplay, it needs to be remembered that other people will be doing the same things that were done when the story was written by the writer.
As a sample the showing in the story is done by the people that run the cameras in the movie.
The writer is to leave out the show part, mostly, and have the tell part left in, but not in detail.
Another sample, the way dialog is said is done by the actor, after the actor has the idea of how the character is feeling and so on.
Because of this the actor playing a main character, which is one with dialog through out the movie, will have an idea of how the character speaks, feels, and does things.
So the way the main character does things and speaks is written less then in the story.
However, a actor who plays a character that only talks a little in the movie, needs more information as to how the character is suppose to speak, feel, and do things.
The settings are not described in detail, since to try to make a setting in the movie to be the same as a setting described in a story can get expensive.
Basically the writer does their part in making a movie and stays out of what others are doing.