Does anyone use the Quick Navigation to get around the forum? It's the little icon along the right side of the page, near the top, that looks like a mind-mapping thing, like below. It brings up a box that scrolls so that you can choose whichever sub-forum you're looking for. It actually starts at the beginning, unlike the screenshot below, where I had already scrolled it some. I rarely use it myself so it won't hurt my feelings if you don't but I thought I'd mention it in case it might be helpful to anyone.
The default style is the one that I have had nothing to do with. That's the way it comes from XenForo. One of these days, I am going to upgrade to a new version since this one is four years old, but upgrading is a scary thing. I've lost two forums upgrading.