Experience Fragments are fully laid out content; a fragment of a web page. So it contains components inside it. If I understand your query correctly, you are wanting to use the components that are used inside the XF as separate site structure components.
To do that, go to the XF path, Ex: /content/experience-fragments/project/XF-name, check the list of components added there. Select the component that you are looking for and get its sling:resourceType --> path and use it elsewhere.
Hope this helps. If not please elaborate on your query.