You can rearrange the windows for each pane in the OctaneRender® interface (Graph Editor, Render Viewport, Node Inspector, and Outliner) by clicking and dragging the square at the top-left corner of each pane (Figure 1).
Clicking the same square with any mouse button brings up more options for rearranging the workspace. You can undock the Render Viewport window to have a wider view of it on a separate screen (Figure 2).
The toolbars for each pane of the OctaneRender interface are customizable as well. To customize the toolbars, right-click on the square upper-left icon of that pane and select Customize Toolbar (Figure 3).
The dialog lets you place the toolbar to any edge of the respective area, and you can re-arrange, add, or remove buttons.