This is quite awesome!
There's a small bug: if you toggle the title several times, the notes start wandering around. Toggling the notes again restores them to their correct position : )
The pitfalls of mutable state. ;)
Hiding the title makes more room on the screen, so I lay out notes in the hope that there is a better placement for them. I could try to preserve the original layout if the new one is not significantly better, but it's too much work :)