In the Graphic Editor, there are two icons for magnification control. One increases, the other decreases. Clicking on those icons increases or decreases the horizontal zoom, making the piano roll and the notes on it longer.
Moreover, option-clicking those icons increases or decreases the vertical zoom, making the piano roll and the notes on it wider.
As it stands, I run my laptop at 1920x1200, so the Graphic Editor window tries to show me ...16 octaves. It doesn't really, though; the bottom five all show as note C-2 (that's five octaves below middle C).
I don't need that much vertical resolution. And while the Tracks window let me save the magnification, the Graphic Editor always loads up at the same eye-squinting, difficult-to-work-with size. How do I save the Graphic Editor at a more manageable magnification?