SceneBuilder 2 allows to turn Text property (same for Prompt Text) of a textField to multiline. You can enter your value on several lines but on Content and in Preview the rendering is always done on a single line, which is confusing.
If you do it with say a Button then the rendering is in sync.

SceneBuilder 1.1 doesn't authorize multiline for Text / Prompt Text properties of a TextField; and if the user manually writes in his FXML files a value with carriage return (something like text="scene
builder") then it is silently ignored and the rendering is always done on a single line (one reads "scenebuilder").

I would say SceneBuilder 2.0 should stick to what version 1.1 is doing, unless I missed something.