By default, the Relativity Designer window has four discrete areas, as shown in Relativity Designer Window. You can configure certain elements of this to suit your needs.
The Catalog Explorer, Properties pane, and the Status pane can all be undocked, and then moved to different locations within the window. Within the Work area, you can also perform similar docking and resizing of tabs, within the confines of the Work area; this is useful if you want to display two FDs side by side, for comparison.
You can also alter the appearance of the Relativity Designer window by applying a theme.