Anchor X (anchorX)
The Anchor X property shifts the attachment point for self-adjusting nodes.
This property is relevant only if the X property is set. It shifts the attachment point for self-adjusting nodes between the point nearest to the parent's coordinate system's origin (value=0.0) and the most remote point (value=1.0). For nodes that are adjusted by their parent this attribute has no effect. A value of 0.5, for example, sets the attachment point to the center of the node.
Type: Numeric.
The value must be a number in the range 0 to 1.
Default value: 0.
You can find the Anchor X property in the Geometry category of the Properties view.