Sections - Sections as stepper
The "rootDisplay" option is not supported in vjsf v3.
Use the x-display="stepper" or x-display="vertical-stepper" annotation to display sections as a stepper. You can also use the rootDisplay option to display root sections as a stepper regardless of the content of the schema.
You can use the x-propsannotation or the stepperProps / verticalStepperProps options to configure rendering.