I have created simple table which purposefully has all cells, except first row and first column, blank.
\documentclass{book}
\usepackage{rotating}
\linespread{1.2}
\begin{document}
\thispagestyle{empty}
\begin{sideways}
\bgroup
\def\arraystretch{1.5}
\setlength\tabcolsep{10pt}
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|}
\hline
Column 1 & Column 2 & Column 3 & Column 4 & Column 5 & Column 6 & Column 7 & Column 8 & Column 9 & Column 10 & Column 11 \\
\hline
Row 2 & & & & & & & & & & \\
\hline
Row 3 & & & & & & & & & & \\
\hline
Row 4 & & & & & & & & & & \\
\hline
Row 5 & & & & & & & & & & \\
\hline
Row 6 & & & & & & & & & & \\
\hline
\end{tabular}
\egroup
\end{sideways}
\thispagestyle{empty}
\end{document}
As you can see, I have made three important changes: \linespread{1.2}
for linespacing for the rest of the document (not relevant for MWE), \def\arraystretch{1.5}
for vertical padding inside cells and \setlength\tabcolsep{10pt}
for horizontal padding inside cells.
I want to have text in the cells to be centered both vertically and horizontally. Without those three commands above, it seems to happen. However, once I add those three commands for better presentation, they seem to move text in the cells below vertical center. Examples:
Is there any way to keep those spacing/padding adjustments, but at the same time make text in the cell centered both vertically and horizontally? Also, why code of MWE creates PDF with two pages, instead of one?