The Scroll To behavior centers the view on the object with the behavior. It is a shortcut for the Scroll to object system action. However, it also provides a Shake action to shake the screen, and if multiple objects have the Scroll To behavior, it will center the view in between all of them.
If you need more advanced scrolling, e.g. limited to certain regions or following the player after a delay, scroll to an invisible object which you control through events.
To scroll, the size of the layout must be bigger than the project's viewport size, or the layout's Unbounded scrolling property must be enabled. Otherwise there is nowhere to scroll to and scrolling will have no effect.
The Scroll To behavior has no expressions.