Use a real wordprocessor, styles compatible with ebooks and either sigil or calibre from a docx file. If using LO Writer only edit the native ODT format and save As an EXTRA copy in docx for Sigil or Calibre.
InDesign is really tool to publish on paper, and even there it's no longer the best solution for a fiction novel.
Use RTF for file interchange but not conversion between programs rather than xml, doc etc. Only use PDFs to submit for paper print.
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