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Controls visible only when necessary
The window controls for minimise and close have been moved to the panel, but still at the top-right corner. I find this design much more natural than the Ubuntu version, with the controls at the top left and application menus appearing and disappearing at different times.
Changing the active window
Click on the window name on the top panel to change the active window. The display will zoom out to show all available windows and the Search and Launch desktop. Click any window or the desktop to select it. When the cursor is over a window an X icon is displayed at the top-right corner, which you click to close the window.
By clicking the unmaximise control, located at the right end of the panel, a window that was started full-screen will be reduced. The window can then be resized in the usual way, by dragging the edges or corners. There is also a set of window controls on the frame, so the window can be maximised or closed by clicking either on the frame or on the panel.