I'm editing a family history, and the index is quite long. I'm using the tufte class, and have used the full-width fix for a bibliography spanning several pages.
However, it's not working for my index, which is also several pages long. (I'm wondering if it has to do with the columns?)
\begin{tcolorbox}[enhanced, breakable, colback=white, colframe=white, check odd page, toggle left and right, grow to right by=\marginparwidth+\marginparsep, toggle enlargement=evenpage]
\printindex
\end{tcolorbox}
I've compiled several times, and here is what I get:
As you can see the entire page looks cut off entirely. How can I fix this?
(BTW, I'm more or less a n00b at this, so please let me know if I should provide more information.)

