You can set how large the media item appears on the page. This should almost always be the normal size, as a custom size will interfere with the layout of the page for readers and make it inconsistent.
You can override how this page is sorted when displayed within a category by setting a different index to sort with instead. This is often used to make pages about people show by last name, but be named with their first name shown first.
You can prevent this category from showing up in the list of categories on member pages. This is useful for categories that are of interest to editors but not most readers, like pages which need an illustration.