Customizing the metamodel : Diagrams: Creating and modifying : Depiction styles
  
Depiction styles
The View > Symbol Depictions command allows you to define the default view of a diagram.
Use the Symbol Depiction button in the tool bar to toggle from one view to another.
Depiction style examples
Normal
Displays a symbol without any graphical adornment. This is the default view, if another view is not selected.
Depiction
Displays the depiction.
Adornment
Displays the symbol as an icon at the top-right corner.
Note An exception to the behaviors described in the table is the BPMN Business Process, where Process symbols display an icon if the Task Type property is specified, in order to comply with BPMN convention.
The BPMN_AllowFullDepictionForProcessr configuration switch can alter the depiction style behavior.
If BPMN_AllowFullDepictionForProcessr=N is specified, when Display As Task Type is selected for a Process symbol on a Business Process diagram, no depiction is presented. N is the default.
If BPMN_AllowFullDepictionForProcessr=Y is specified, when Display As Task Type is selected, a full depiction is presented for a Process symbol on a Business Process diagram if the value of the Task Type has an associated depiction.