Here are a couple of formatting tips that you can follow to have your paperback book look more polished. Forst let's reduce the sizing of the indentation and line spacing which will make it look more professional but will also reduce your page number and the cost of self-publishing. Then create a header with either the title of your book, your author name or the sections/chapters you are in. Finally you can create a dropdown at the beginning of every new chapter. Let me know if this video was he

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How to Create and Utilize Research Appendices Effectively