I use Evernote for work, when at office or home I refer to my Evernotes very frequently for my job tasks.
I use my email provider Doc service for a personal project. I have moved it to my Evernote as it's my favorite note editing tool, but the personal note shows up in the most recently edited notes which I might accidentally display it to others.
My current solution: I move the note to Trash, restore it to edit, then move it to Trash and so on, that's my solution to hiding it.