Using Gradient Settings
The Gradient ribbon on the Styling tab enables you to visually change the style of a model using actual values in the data. You can represent model elements and highlight important elements based on their values by starting at one setting for the lowest value and another setting for the highest value. You do this by determining the appearance of entities and relationships. For instance, if your model uses insurance claim data and one of the entity properties is the dollar amount of claims, you could set pink as the color for the entity with the lowest claim amount and red as the color for the entity with the highest claim amount, and the entities for everything in between those two dates would fall somewhere between pink and red.
Settings made here will apply to all entities or relationships, whereas settings made in the Entity Settings or Relationship Settings are apply only to selected entities or relationships.
For more information on gradient settings: