So you open libreoffice for example, after write a little, and save, and you saver other time, and in this time you can hear a noise that is annoying.

How can i remove this sound, me don't like

no sounds are triggered by KDE apps, only by LibreOffice and only when saving?

what does the sound sound like?

afaik LibreOffice has no sound configuration options so this strange

test it with netbeans

does the "noise" come out of your boxes or from somewhere else?
can you suppress it by muting sound?
does it sound like a chime or rather like clicks or humming?
does it go along some dialog or popup?