How to remove KDE icons from Ubuntu 20.04 after uninstalling Latte Dock
Solution 1:
Check for said items within /usr/share/applications/
To verify, review the Name= field inside, or search for the terms you want to remove.
$ cd /usr/share/applications/
$ grep -lR -e "KDE Connect" -e "KDE System Settings" -e "KWallet"
With results, move them into a directory where the system wont see them.
$ mkdir hidden_items
$ mv kde-description.desktop ./hidden_items
$ cd hidden_items
$ ls
You might need sudo privileges.