You can preview the current state of the FXML app by using the Preview menu item:
The Components window has a convenient search box at the top to avoid looking through the categories:
Below Hierarchy, there is a Controller view.
It allows you to set the Controller name—be careful of typos; it's just a text field for SceneBuilder. Also, all fields that you intend to use in the Controller and marked with fx:id will be listed here:
Based ...
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