Story length

I have no clue how to even word the title but whatever. When creating new stories, we should be able to pick what it is - flash fiction, short story, novel, novella, - or be able to put in our word length. I like the idea of using SW for my world building (I do my own writing) and creating but everything comes out for full length novels. I don’t only write full length novels and I know I’m not the only one.