Regarding the container widget, which statement is false?

The statement that containers always span 1 - 12 columns is inaccurate because containers are not confined to a specific column span. They can be designed to span a variable number of columns depending on the layout requirements set in the OutSystems environment. This flexibility allows developers to create responsive designs that adjust based on screen size and layout needs, thus not limiting containers to a strict 1 - 12 column configuration.

On the other hand, the remaining statements are accurate: containers indeed serve the purpose of grouping multiple widgets together (which aids in organization and layout management), can contain other containers (allowing for nested structures), and can be empty (providing flexibility in layout design where sometimes it is necessary to have a container without any immediate widgets).