"Probably the first thing you should know about KDE 4 is that it
has separate views for customizing desktop and panel options.
"On the desktop, you cannot add widgets (or, depending on the
distribution, icons) until you go to the desktop toolkit -- the
cashew or kidney-shaped icon in the upper right of the desktop --
and select Unlock Widgets. When this selection is chosen, any
widget or icon you add has a collar of four mini-icons. From the
top to the bottom, these mini-icons allow you to resize, move,
configure, and delete the widget to which they are attached. After
you are finished adding a widget or icon, select Lock Widgets from
the desktop toolkit to prevent further editing. You can still
right-click on the desktop and select Icons to sort and align
"The panel works the same way, requiring you to select Unlock
Widgets from its right-click menu before you can customize
anything. Once you have done so, select Panel Options -> Panel
Settings to get into customization mode. A configuration panel
appears above the actual panel that allows you to move the panel to
another edge of the screen, adjust the height, add widgets -- the
same set as on the desktop -- and autohide the panel. Below the
customization panel, you'll also find slider arrows for changing
the width of the panel."
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