You can open your FXML files in JavaFX Scene Builder from within IntelliJ IDEA. To do that:
- Select the FXML file of interest in the Project tool window, or open the file in the editor.
- From the context menu, select Open In SceneBuilder.
- If it's the first time you open an FXML file and you haven't specified the Scene Builder executable file yet, the SceneBuilder Configuration dialog opens. In this dialog, select the executable file and click OK.