Is this just a huge and silly overlook that's been around for many years now? I don't get why not just make it 88 keys. Which is what a piano is. And the main S88 would then fully line up with what is also on screen. Why not make that panel resizable? Or if that's impossible for some reason, you could lose maybe a few pixels on each key and fit in the full 88.
Just seems really odd to me. Is there another reason why? It can mean the difference of not seeing your mapped keys properly.