A MonkeyLoader mod for Resonite that makes UIX elements selectable and editable with the usual Slot gizmos, as well as fixing UIX elements breaking when a parent is inserted.
Selection, Gizmo and Slot creation behavior, as well as the names of newly inserted slots can be modified in the settings.
Using the Create Pivot at Center button on Slots will create a parent with a point-anchor and symmetrical offsets to achieve the size.