Do not use WPS Office to write a book!The program is little known out side China. The free version is not complete. The Linux version is still an experimental one: incomplete and liable to problems. Nobody will understand its file format, either, although the files can be converted to the old Microsoft .doc format.
Use LibreOffice, which you've already got. It will support any paper format from A5 to Big Kai (what ever that may be!) and its file format is an International Standard. You can also get a pdf manual.
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