Themes for UML diagrams
Themes define the look of all the elements in the UML diagrams
that you create. You can use themes to change the appearance of a
diagram, several diagrams or individual diagram elements.
Predefined themes
UML diagrams have a predefined theme applied to them. You can change the diagram theme to other predefined themes that are provided with the product. You cannot delete or change predefined themes, but you can use a predefined theme as a template to create your own theme.
Custom themes
You can create your own themes to apply to one or many diagrams. You can use a predefined theme as a starting point for your template and then customize it further.