See Only Available Building Blocks for Your Flow Type in Flow Builder
Flow Builder helps you create flows more efficiently by making only
usable elements, resources, and screen components available while you’re building. For
example, you can’t use screen elements if you’re building an autolaunched flow. Previously,
Flow Builder displayed all elements, resources, and components for all flow
types.
Where: This change applies to Lightning Experience and Salesforce Classic in Essentials, Professional, Enterprise, Performance, and Unlimited editions.