Oops replied to wrong post a few minutes ago! 
@plannermouse can you record a GIF and show me? If not, a screenshot.
You need to highlight something, then select any text within that highlight (yellow) and then press Alt+A. Then it turns red and becomes header. Everything will be indented under that header.
Then if you want another header later just do the same thing and stuff will now be indented under it for anything highlighted after it.