The Flow.overflow rules.
Values
Expand
Children larger than Flow.maxWidth / Flow.maxHeight will expand the flow size.
Limit
Limits the bounds reported by the flow using Flow.maxWidth or Flow.maxHeight, if set.
Children larger than max size will draw outside of the Flow bounds or overflow if Flow.multiline is enabled.
Hidden
Limits the bounds reported by the flow using Flow.maxWidth or Flow.maxHeight, if set.
Compared to Limit - Flow will mask out the content that is outside of Flow bounds.
Scroll
Similar to Hidden but allows to scroll using Flow.scroll* properties for control.