The Relation Window has two types of views: Outline view and Graph view. The Graph view shows symbols as graph nodes with lines connecting them. The Relation Graph Options command (available on the Relation Window right-click menu) gives you control over the appearance of the graph view.
The Relation Window outline view is a compact, textual view of the relation hierarchy. You can click to expand and collapse levels in the outline.
The Relation Window graph view is a visual representation of the same relationship as the outline view. You can expand and collapse nodes in the graph. You can select either a horizontal graph layout, or a vertical graph layout. You can also print the graph, or copy the graph images to the system clipboard so you can process it in another imaging program.
To expand or collapse a node, hover the mouse cursor first over the right or left edge of the node in a horizontal graph (or the top or bottom middle of a node in a vertical graph). The mouse cursor will contain a + or - symbol. Click to expand or collapse.
You can choose Graph View options by right-clicking on the Relation Window and selecting Relation Window Graph Options. See: Relation Window Graph Options.