When navigating the Element Manager window, designed elements may be selected by two different methods. Selecting an element by clicking it in the summary causes it to automatically be selected in the Revit interface.
Conversely, selecting an element in the Revit UI will automatically highlight the corresponding calculation in the Element Manager and load its detail info in the lower half of the window.
In a model that contains many designed elements, the Element Manager will automatically display a scroll bar to navigate down the list of elements.
For easier navigation without a scroll bar, the summary table may be enlarged by manually stretching the Element Manager window. When the window is stretched, the lower details area remains the same size and the summary table grows to fit.