Disintegrating desktop

[Timothy Murphy]

I'm running Fedora-21/KDE on my laptop.
The window I'm watching frequently disintegrates
into 8 separate windows, corresponding to my 8 virtual desktops.
I know this is caused by moving the mouse into some area.
But I cannot think of any occasion when it would actually help.

Is there any way of turning this facility off?

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin