There are three chance to choose: Export, Print and Exit. The relations you can export to png.
You can change the sheet by selecting another sheet from this menu. The present sheet is marked with a point.
If you have done changes and them not appear to the Relaions-view press F5-button.
If there is no primarykey in the relations-view there are no lines between relations. You have to define primarykeys at the drawing-view for all of the entities.
Relations are arranged casually and you have to arrange them yourself.