The way to fix the line-height is to open the book in the Editor, double-click on the stylesheet.css file (at the left below the *.html files), and then change the lines that start with line-height to 1.2 (1.2em will work, too, but you only need 1.2).
If you don't like the font that's in the body text, find the class used for the body. Open one of the *.html files and look at the "body" line for the class (near the top of the file). Then find that class in the *.css file and remove any font-family line.
You can find lots of pages on the web that will teach you about CSS codes, if you ever decide to learn the basics.
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