I agree!
It's great to be able to switch to full focus on a note and hide everything else. Especially in the full screen mode.
But then it is clumsy to switch back to viewing the notes list when changing between notes. There's already a nice shortcut for switching full screen mode on and off. Adding a shortcut for expanding the view to one note only, would make it great to enter in full focus writing mode with just two shortcut keys!