Which statement is false about the Container widget?

The statement indicating that all containers must have at least one widget inside is false. In OutSystems, a container can exist without any child widgets. This flexibility allows developers to create complex layouts without immediately populating a container with content. It serves as an organizational element in the UI, enabling developers to manage and arrange other widgets effectively.

Containers are indeed useful for grouping widgets, can span multiple columns, and can be nested within other containers, enhancing layout designs. Therefore, the ability for a container to remain empty is integral to its function of providing structure in the web application. This means it can be used strategically to maintain alignment or space in the user interface even if that specific container doesn't hold visible content at that moment.