Longtable 最后一列太宽

Question 1

可以将标题文本重复到每一页，并且不会使第三列太宽，只需将标题文本设置为两行即可。该makecell软件包允许这样做。

\documentclass[12pt, a4paper, onecolumn, oneside, final]{report}
\makeatother

\usepackage{array}
\setlength\extrarowheight{4pt}

\usepackage{tabto}
\newenvironment{tabs}[1]
{\TabPositions{#1}}

\usepackage{longtable}  
\newcolumntype{R}[1]{>{\raggedleft\arraybackslash}p{#1}}
\newcolumntype{L}[1]{>{\raggedright\arraybackslash}p{#1}}

\usepackage{multicol}
\usepackage{multirow}
\usepackage{musicography}

\usepackage{bigstrut} % added <<<<<<<<<<<<
\usepackage{makecell} % added <<<<<<<<<<<<

\begin{document}
    \setlength{\LTleft}{-20cm plus -1fill}
    \setlength{\LTright}{\LTleft}
    \begin{small}
        \begin{longtable}{|p{1cm}|p{2cm}|p{4cm}|}
            \caption{\textit{Pitch class} yang digunakan dalam penelitian}
            \label{tbl:pitchClassUsed}\\
            \hline
            {\textbf{No}} & {\textbf{No. MIDI}} & {\textbf{\textit{Pitch Class}}} \bigstrut\\
            \endfirsthead
    % next line changed <<<<<<<<<<<<                    
            \multicolumn{3}{c}{\makecell{\textbf{\tablename~\thetable} \textit{Pitch class} yang digunakan \\ dalam penelitian (Lanjutan)}}\\[12pt]     % changed <<<<<<<<<<<<
            \hline
            {\textbf{No}} & {\textbf{No. MIDI}} & {\textbf{\textit{Pitch Class}}} \bigstrut\\
            \endhead
            
            \hline
            1     & 0     & \multicolumn{1}{l|}{0} \bigstrut\\
            \hline
            2     & 30    & F$\musSharp$1 / G$\flat$1 \bigstrut\\
            \hline
            3     & 31    & G1 \bigstrut\\
            \hline
            4     & 32    & G$\musSharp$1 / A$\flat$1 \bigstrut\\
            \hline
            5     & 33    & A1 \bigstrut\\
            \hline
            6     & 34    & A$\musSharp$1 / B$\flat$1 \bigstrut\\
            \hline
            7     & 35    & B1 \bigstrut\\
            \hline
            8     & 36    & C2 \bigstrut\\
            \hline
            9     & 37    & C$\musSharp$2 / D$\flat$2 \bigstrut\\
            \hline
            10    & 38    & D2 \bigstrut\\
            \hline
            11    & 39    & D$\musSharp$2 / E$\flat$2 \bigstrut\\
            \hline
            12    & 40    & E2 \bigstrut\\
            \hline
            13    & 41    & F2 \bigstrut\\
            \hline
            14    & 42    & F$\musSharp$2 / G$\flat$2 \bigstrut\\
            \hline
            15    & 43    & G2 \bigstrut\\
            \hline
            16    & 44    & G$\musSharp$2 / A$\flat$2 \bigstrut\\
            \hline
            17    & 45    & A2 \bigstrut\\
            \hline
            18    & 46    & A$\musSharp$2 / B$\flat$2 \bigstrut\\
            \hline
            19    & 47    & B2 \bigstrut\\
            \hline
            20    & 48    & C3 \bigstrut\\
            \hline
            21    & 49    & C$\musSharp$3 / D$\flat$3 \bigstrut\\
            \hline
            22    & 50    & D3 \bigstrut\\
            \hline
            23    & 51    & D$\musSharp$3 / E$\flat$3 \bigstrut\\
            \hline
            24    & 52    & E3 \bigstrut\\
            \hline
            25    & 53    & F3 \bigstrut\\
            \hline
            26    & 54    & F$\musSharp$3 / G$\flat$3 \bigstrut\\
            \hline
            27    & 55    & G3 \bigstrut\\
            \hline
            28    & 56    & G$\musSharp$3 / A$\flat$3 \bigstrut\\
            \hline
            29    & 57    & A3 \bigstrut\\
            \hline
            30    & 58    & A$\musSharp$3 / B$\flat$3 \bigstrut\\
            \hline
            31    & 59    & B3 \bigstrut\\
            \hline
            32    & 60    & C4 \bigstrut\\
            \hline
            33    & 61    & C$\musSharp$4 / D$\flat$4 \bigstrut\\
            \hline
            34    & 62    & D4 \bigstrut\\
            \hline
            35    & 63    & D$\musSharp$4 / E$\flat$4 \bigstrut\\
            \hline
            36    & 64    & E4 \bigstrut\\
            \hline
            37    & 65    & F4 \bigstrut\\
            \hline
            38    & 66    & F$\musSharp$4 / G$\flat$4 \bigstrut\\
            \hline
            39    & 67    & G4 \bigstrut\\
            \hline
            40    & 68    & G$\musSharp$4 / A$\flat$4 \bigstrut\\
            \hline
            41    & 69    & A4 \bigstrut\\
            \hline
            42    & 70    & A$\musSharp$4 / B$\flat$4 \bigstrut\\
            \hline
            43    & 71    & B4 \bigstrut\\
            \hline
            44    & 72    & C5 \bigstrut\\
            \hline
            45    & 73    & C$\musSharp$5 / D$\flat$5 \bigstrut\\
            \hline
            46    & 74    & D5 \bigstrut\\
            \hline
            47    & 76    & E5 \bigstrut\\
            \hline
            48    & 77    & F5 \bigstrut\\
            \hline
            49    & 81    & A5 \bigstrut\\
            \hline
            50    & 83    & B5 \bigstrut\\
            \hline
            51    & 85    & C$\musSharp$6 / D$\flat$6 \bigstrut\\
            \hline
        \end{longtable}%
    \end{small}%
\end{document}

笔记（与问题无关）

您可以通过将前两列居中来改善表格的外观。

添加 \newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}

并使用 \begin{longtable}{|C{1cm}|C{2cm}|p{4cm}|}

更新

导致最后一列变宽的原因是原本要放置在下一页表格顶部的文本。

它不是一个“标题”，而是表格中的多列单元格，比三列的总宽度更宽。

不要重复标题文本，好像它是表格的开头，最好用它来将表格的这一部分与前一部分联系起来。还建议使用表脚来提醒读者这不是表格的结尾。

第三列现在可以更窄一些。

longtable从这里开始

        \begin{longtable}{|C{1cm}|C{2cm}|p{2.5cm}|}
            \caption{\textit{Pitch class} yang digunakan dalam penelitian}
            \label{tbl:pitchClassUsed}\\
            \hline
            {\textbf{No}} & {\textbf{No. MIDI}} & {\textbf{\textit{Pitch Class}}} \bigstrut\\
            \endfirsthead
            % next lines changed <<<<<<<<<<<<           
            \multicolumn{3}{c}{\textbf{\tablename~\thetable} \, \textit{\dots{} from the previous page}} \bigstrut\\                
            \hline
            {\textbf{No}} & {\textbf{No. MIDI}} & {\textbf{\textit{Pitch Class}}} \bigstrut\\
            \endhead
            \multicolumn{3}{r}{\textit{continued on the next page \dots{} }}
            \endfoot                
            \endlastfoot
            %% ***************************************
            \hline
            1     & 0     & \multicolumn{1}{l|}{0} \bigstrut\\
      ...........

Answer