Each layout theme includes default styles for the
objects and
layout parts that you create while using that theme. Some themes have additional default styles for some objects. For example, some themes include styles for how the dots on a slide control are displayed or for formatting rows in portals. A theme also includes a default style for the layout background. Styles give objects and parts on a layout a consistent appearance. They also save you the time of reassigning formatting attributes each time you create a new object or part.