The use of more TABS at the bottom of the Book might work. A TAB for each Element perhaps.
Even better, a tab for each spellbook altogether. This is organizationally convenient once you end up with a lot of spells, and fluffily represents the idea that you're amassing a magical library. There would have to also be a view more like the current one, though. That view is fine, it just really should be made bigger, and layout elements should take up less real estate. A big portion of the current setup is the edges of the books and etc, and that stuff uses only a relatively small portion of my screen.