Diagram layout can be controlled in a number of ways. Diagram shapes can be moved (by dragging them with mouse or by keyboard), resized, aligned to the diagram grid. Read Aligning Shapes and Changing Shape Size topics for more information.
Fusion for MySQL allows you to layout a diagram automatically or manually. To resize the diagram automatically, just click the Layout Diagram button on the Devart - Diagram toolbar.
You may change shape order either by right-clicking them and choosing Bring to Front or Send to Back on the Shape submenu of the shortcut menu, or by using the corresponding buttons on the Devart - Layout toolbar.