Rewrite preparation for 0.65 release :
Before : Synfig Studio is a SDI application. The panels are dockable. It means that you can group then in vertical or horizontal dock windows. Just drag and drop by the Panel tab.
After : Synfig Studio has a comprehensive dock system. The panels (and the Canvas) can be docked or panned. It means that you can group then in vertical or horizontal dock windows and/or place them up, down to the left or to the right. Just drag and drop by the Panel tab and put it down on another dock or place it using the Placement Widget. This way, you can arrange the workspace of Synfig Studio to a SDI, MDI or TDI application, single or multiple windows. The panels list and predefined workspaces can be found in the Window menu