In LibreOffice 5.4.6.2 Writer Navigator I can choose Navigation → Headings, and switch between headings of all levels with the next/previous buttons, but I can’t find the “To Next/Previous Heading” in the list of available functions in Tools->Customize->Keyboard. How can I assign a “To Next/Previous Heading” keyboard shortcut?
you cannot assign that shortcut. But you can fill enhancement in bugzilla about it