Panel windows can be grouped together into a single, tabbed window. In the picture below, the Clips panel is floating by itself on the left, and three other panels are grouped together into a tabbed panel on the right.
To group a panel with another panel:
1.Click on the source panel’s title bar and drag and drop it in the tab area of another panel window.
To group two non-grouped panels:
1.Drag the source panel so it hovers over the title bar area of the destination panel. A ghost tab will appear. Release the mouse button to group the panels.