Object browser pane
The left-hand pane shows a dynamic tree representing the hierarchy of objects maintained in your current model. The tree is collapsible, but expanded by default. For large models, it can be quite long.

You may adjust the width of the pane by moving the vertical ellipse
separating the Object Browser and central panes. You may toggle the appearance of the Object Browser pane by choosing the menu option View > Object Browser, or by double-clicking on the vertical ellipse.
To collapse a tree branch, click on
. To expand a tree branch, click on
.
It is possible to toggle the appearance of the Object Browser pane from the workspace by choosing the menu View > Object Browser.Pane.
A single-click on an object increases the ERD zoom on the selected object, and displays the corresponding properties in the Properties Pane.
A double-click on an object opens the hierarchical schema view and zooms in on the selected object.