When you select an element in the model view, the properties for that element appear in the Properties panel in the lower right. The Properties panel allows you to view all the business information associated with the element. The panel will only appear when an element is selected and will disappear when the element is deselected.
If you select a property and then right click, a menu appears allowing you to Find Similar. The Find Similar option finds all related items that have the same class and property value and displays them in the search results tab.
To view properties of assemblies just change the Selection Scope from the control at the bottom right and select the element in the view again.