For performance reasons, Presentation Designer uses system-wide resources to render user interface elements. As a result, if you select a theme that changes how the interface renders, the look-and-feel of the entire Presentation Designer application changes to match. For example, if you change from using the System theme to using the Javagui theme, the user interface of your application will change significantly, as will the user interface of the designer. However, if you change from a 3270 theme to a 5250 theme, there is no change to the designer interface.
Don't Show This Again: Select to prevent this message box from appearing each time you change to a theme that renders the Presentation Designer interface with a different look-and-feel. To re-enable this message box, from the Theme page of the Project Properties dialog box, select Show Message When Look & Feel Changes.
|Setting Project Properties|
|Presentation Designer Help Links|