I’m sorry, this is not, and I’ve already seen “this”. And your snippet doesn’t work by the way, you can’t hide “Help” or “Settings” or “Open another vault”.
What I am looking for is to hide a particular item from your right-click to a folder or a note.
And for hide the icon from the right sidebar Customizable Sidebar is helpful.
It would be best if you tried the snippet I gave above, and you’ll see what exactly what do I mean.