Hmm #KDE #Plasma seems pretty leaky with file and clipboard history data.
<br /><a href='https://unix.stackexchange.com/questions/797205/how-can-i-completely-disable-and-clear-kde-dolphin-history-features'>https://unix.stackexchange.com/questions/797205/how-can-i-completely-disable-and-clear-kde-dolphin-history-features</a> 
<br />Pay particular attention to deleting ~/.local/share/klipper and the recent documents folder in ~/.local/share/  
<br />#Linux