Here are some UI changes I’m finding as I looked through LO 23.2 Writer. Mostly wording, so not mentioned in the Release Notes.
These may also be relevant to the Getting Started Guide and some of the other guides.
I will add to this list as I find more.
Under Tools > Options, Language Settings is now Languages and Locales, Languages is now General, and Sentence Checking is gone. LibreOffice Writer > Compatibility has some new options, and the box at the top is gone.
File > Ptoperties: Description tab has many new fields, which may affect any screenshots even if not described in the book.
Paragraph Style dialog: Organizer tab: AutoUpdate is now Autromatic update from document. Text Flow tab: the Options section is now called Split Options and Orphan control / Widow control have changed to descriptions.
List Style dialog: Position tab: Several field names have changed.