I am writing a long LaTeX document using the book documentclass, and after having typed already almost 400 pages, I have decided I want to change the format for new paragraphs to be more similar to the letter style, meaning that instead of an indented line, I would like to have some vertical space between paragraphs (not as much as a whole line) and the new paragraph to begin without indentation.
I could do this by placing \noindent at the beginning of each paragraph, and maybe adjusting the space with \vspace, but I imagine there is a better way than doing this one paragraph at a time for over 400 pages...


\usepackage{parskip}. But, please, don't inflict pages full of white bands to your readers… – egreg Mar 19 '22 at 13:55