Reference frame for GUI. A rectangle box that displays only a [member border_color] border color around its rectangle. [ReferenceRect] has no fill [Color]. If you need to display a rectangle filled with a solid color, consider using [ColorRect] instead. Sets the border [Color] of the [ReferenceRect]. Sets the border width of the [ReferenceRect]. The border grows both inwards and outwards with respect to the rectangle box. If [code]true[/code], the [ReferenceRect] will only be visible while in editor. Otherwise, [ReferenceRect] will be visible in the running project.