Restoring KDE's default setting can be done by deleting the following directories:
kde*
.skel
*Desktop
Please notee that all program settings will be reset to default. Therefore, all setting changed , include address books and e-mail settings, will be lost.
Enter the command in Terminal:
rm -rf .kde*/ .skel/ *Desktop/
Related article: How to Hide/Display icon on desktop, gconf-editor.
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