[Doitsu]

Originally Posted by ash-f

Also try to find a sample epub that can show Logical TOC on the internet and cloudn't find one.

In epub2 books, the logical TOC is defined in the NCX file, which you can generate via Tools > Table of Contents > Generate Table of Contents.

If the Generate Table of Contents dialog is empty, you'll need to wrap all headings in heading tags, e.g. <h1>Chapter 1</h1>.

If you've created an epub3 book with the latest Sigil version, you'll have to select Epub3 tools > Generate guide/ncx for epub2 readers.