If you aren't using styles, then why are you using a word processor? You could just an electronic typewriter with memory and be done. Styles make things so much neater and easier and more consistent. No one can use Word's paragraph numbering because it is broken - other programs get it right, but Word has always managed to bugger things up.
That said, the ribbon sucks. There is no order, the entries are all different sizes mixed all higgeldy piggeldy so that trying to find a specific item is like running your eyes across a bumpy road.