Expanding a model
Choose Expand Model under the Model menu to expand out all branches of a model in the navigation pane.
Collapsing a model
Choose Collapse Model under the Model menu to collapse all branches of a model in the navigation pane.
Expanding and collapsing parts of a model
When a model is open it is displayed in the navigation pane using a commonly used, hierarchical structure. To expand and collapse parts of this hierarchy, click on the + and - symbols next to the part of the structure you want to expand or collapse. Alternatively, you can double click on the name or icon of a part of the hierarchy (other than a ruler) to expand or collapse it.