The source code editor displays the DDL source code and annotation types with predefined colors. However, you can change these default settings to adapt them to your personal needs. You can define the color for displaying the keywords, identifiers, annotation, or further code elements in DDL source code.
Procedure
Open the GeneralAppearanceColors and Fonts preference page.
Expand the folders CDS DDL.
Select the text type you want to change and click the Edit... button.
Select the color and confirm with OK.
Results
The new color settings become immediately effective in the source code editor.
General 
Appearance 
preference page.