What to use for WYSIWYG Java GUI application?

Question

Java

What program can easily make a GUI in Java? WYSIWYG?
Oracle JavaFX Scene Builder - seemed incomplete in terms of capabilities, not understandable. Most clear to me would be the concept of both Delphi and Vlc windows components, with a simple task of coordinates by changing properties or dragging with the mouse.
Do java programmers manually edit files like

<center>
      <GridPane hgap="5.0" vgap="5.0" BorderPane.alignment="CENTER">
        <columnConstraints>
          <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
          <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
            <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
            <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
        </columnConstraints>
        <rowConstraints>
          <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
          <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />

Answer 1

Javafx applications are laid out in Scene Builder. Alternatives - fxml by hand or calling methods from Java code. You can also use css.

Answer 2

Alternatively, you can try using the form editor built into IntelliJ IDEA.

Answer 3

there is also gluon scene builder
which is similar to javafx scene builder but less buggy.
gluonhq.com/labs/scene-builder