内容目录和表格目录分栏

在 multitoc 宏包的问题，没有处理 false 分支的情况。
在它后面加上：

\makeatletter
\renewcommand*{\@starttoc}[1]{%
   \ifthenelse{\boolean{@multitoc@toc}\and\equal{#1}{toc}}{%
      \begin{multicols}{\multicolumntoc}%
         \@multitoc@starttoc{#1}%
      \end{multicols}%
      }{%
   \ifthenelse{\boolean{@multitoc@lot}\and\equal{#1}{lot}}{%
      \begin{multicols}{\multicolumnlot}%
         \@multitoc@starttoc{#1}%
      \end{multicols}%
      }{%
   \ifthenelse{\boolean{@multitoc@lof}\and\equal{#1}{lof}}{%
      \begin{multicols}{\multicolumnlof}%
         \@multitoc@starttoc{#1}%
      \end{multicols}%
      }{\@multitoc@starttoc{#1}}%
   }}}
\makeatother

我测试的代码正常，看看 multitoc 的说明：

\documentclass{ctexbook}
\usepackage{tabularray}
\usepackage[lot]{multitoc}
\begin{document}
    \listoftables\let\cleardoublepage\clearpage

\NewTblrTheme{fancy}{
    \SetTblrStyle{firsthead}{font=\bfseries}
    \SetTblrStyle{firstfoot}{fg=blue2}
    \SetTblrStyle{middlefoot}{\itshape}
    \SetTblrStyle{caption-tag}{red2}
}
\begin{longtblr}[
    theme = fancy,
    caption = {A Table},
    entry = {Caption},
    ]{
        colspec = {XXX}
    }
    Head & Head & Head \\
\end{longtblr}
\end{document}