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Doesn't work for me. The option is always greyed out, and I don't actually see "Float Selected Note," it is always "Float on top" no matter wether my window is floating or not. But I can see on Google that it is yet another common problem in macOS. I run Sierra.

And I see the same situation on my girlfriends Mac, also with Sierra.
 
Doesn't work for me. The option is always greyed out, and I don't actually see "Float Selected Note," it is always "Float on top" no matter wether my window is floating or not. But I can see on Google that it is yet another common problem in macOS. I run Sierra.

And I see the same situation on my girlfriends Mac, also with Sierra.

Did you double click on the note so that it’s in its own window first?
 
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