The Diagram Controls View is used to access controls and information about the currently selected diagram.
To open this view you can use the Open Diagram Controls button
on the diagram editor toolbar or:
Select Window-Show View-Other

Click on Diagram Controls and press OK.

Name is the simple name of the Diagram Style through which the diagram is currently being viewed.
Defined In is the location of the profile file which holds the definition of the current Diagram Style.
Description is the description of the Diagram Style taken from its definition.
Switches is a list of any switch values applied to the Diagram Style
Scope defined by Element Set is the id of the Element Set which defines the scope, if the current diagram has a scope.
Declared In is the name and location of the file in which the scope Element Set is defined.
Description shows the description - if any- taken from the definition of the scope Element Set.
Total Classes/Interfaces is the number of top level classes currently on the diagram; inner classes are not counted.
Zoom is the scale at which the diagram is currently being viewed, with 100% being the maximum (largest) zoom.
Selection is the number of classes currently selected on the active diagram.
Size is the dimensions in pixels of the diagram when viewed at 100% zoom.