Configure JavaFX Scene Builder
IntelliJ IDEA allows you to open .fxml files in JavaFX Scene Builder right from the IDE after you specify the path to the Scene Builder application in the settings.
Configure JavaFX Scene Builder in IntelliJ IDEA
Download and install the latest version of Scene Builder.
Click in the Path to SceneBuilder field.
In the dialog that opens, select the Scene Builder executable file and click OK.
Apply the changes and close the dialog.
Open files in Scene Builder
When you open an .fxml file in the editor, there are two tabs underneath the editing area: the Text tab is for developing the markup, and the Scene Builder tab is for editing the file in Scene Builder.
Scene Builder 2.x. and later.
If you are using Scene Builder of the version 2.x. and later, the files will be opened in Scene Builder on the Scene Builder tab by default.
Scene Builder 1.x
If you are using Scene Builder of the version 1.x, the Scene Builder tab is empty. In this case, right-click the necessary .fxml file in the Project tool window and select Open In SceneBuilder from the context menu.