Docking the Debugger tool windows
To dock a tool window in the Debugger, click the frame of the window and drag to the side of the Source window where you want to fix the window’s position. The small tool window enlarges to fit the side or bottom of the Source window.
To undock a tool window, click the frame of the tool window and drag to the center of the screen until the small outline appears, then release.
To disable docking, choose View|Tool Window Properties and uncheck the tool windows for which you want to disable docking.