Putting \Large right after \begin{document} like above works. All texts in the document is large as I wanted.
But the catch is that when I use partial compile feature (compiling only a current section, or only a current paragraph instead of compiling the whole document) of my LaTeX editor, the text size of the resulting dvi is not large, because the \Large command is not in the preamble.
But putting a \Large command in the preamble doesn't work either.
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And: Currently, Packt sells ebooks for $4.99 each if you buy 5 of their over 1000 ebooks. If you choose only a single one, $9.99. How about combining 3 LaTeX books with Python, gnuplot, mathplotlib, Matlab, ChatGPT or other AI books? Epub and PDF. Bundle (3 books, add more for higher discount): https://packt.link/MDH5p