If you cut text in a "separate window" note, it will delete the text, but it won't actually copy it unless you issued the command for a note in the main window. So when you go to paste it elsewhere, you find it's gone, and then you often find Notes has lost the undo history too.
If you cut text in a "separate window" note, it will delete the text, but it won't actually copy it unless you issued the command for a note in the main window. So when you go to paste it elsewhere, you find it's gone, and then you often find Notes has lost the undo history too.