Figures can be added to the canvas in one of three ways:
A disadvantage of the first method is that if the figure has compartments and content is added to a compartment, then the figure will not be extended after the content is added. This means that, depending on the size of the figure, the compartment content may not be visible until the parent figure is expanded. Using the second and third methods have the advantage of automatic figure re-sizing to accommodate sub-figures being added.
See Arranging Figures for more information on auto-sizing.