This property is used to automatically size parent UI objects based on the size of its descendants. Developers can use this property to dynamically add text and other content to a UI object at edit or run time, and the size will adjust to fit that content.

When AutomaticCanvasSize is set to an Enum/AutomaticSize|Enum.AutomaticSize value to anything other than None, ScrollingFrame/CanvasSize may resize depending on its child content.

For more information on how to use this property and how it works, please see the following article: How to use AutomaticSize.