Selecting JBoss Tools > Web > Editors > JSF Flow Diagram allows you to specify some aspects of the Diagram mode of the JSF configuration file editor.
The first two items control the background grid for the diagram. The next two items allow you to control the appearance of the labels for views (pages) and the transitions between views. For these two items, clicking the Change... button allows you to assign a font with a dialog box.
The first check box determines whether a view in the diagram that doesn't have a transition connecting it to another view yet should be written to the source code as a partial navigation rule. The next check box determines whether the diagram cursor reverts immediately to the standard selection mode after it's used in the transition-drawing mode to draw a transition. Finally, the last two check boxes concern shortcuts. A shortcut is a transition that is there but isn't actually displayed in the diagram as going all the way to the target view it's connected to, in order to make the diagram clearer. With the check boxes, you can decide whether to display a small shortcut icon as part of the shortcut and also whether to display the target view as a label or not.
Selecting the Add Page tab in the JSF Flow Diagram screen allows you to determine the default template and file extension for views (pages) you add directly into the diagram using a context menu or the view-adding mode of the diagram cursor.