client.start() as props on FormFilling. You do not pass rootElement. The component renders the hosted UI in .suki-form-filling for you.
React
Properties
Set height on.suki-form-filling before the hosted UI opens. Refer to Container sizing.
Next steps
StartOptions - Matching fields for JavaScriptclient.start().
Configuration - How to set forms, correlation_id, and container height.
React integration - Provider and FormFilling wiring.
Callbacks - When onSubmit, onReady, and onCancel run.