when u press windows key and search for anything.......some recently used items too pop up and they may sometime really risk the privacy.....
all you have to do is just delete this file--->
Code:
.local/share/recently-used.xbel
and then restarting computer(or ALT+F2+r+ENTER) removes recent items but they are again visiible......to help you again
could have been much simpler...