I may not be getting it right, but I understand that if you want different level headings (section, subsection, subsubsection, etc.) to have different formats, you should just set the formatting preferences in the right pane. Sections that are promoted or demoted should change their formatting according to their new level.
This is not working for me. If I move a section to another place and change its level, it keeps the original formatting.
Hope it helps.
All the best