Alright, tried to edit the CSS, and found that I can't because I'm not admin, and it's a protected page. Here's a bit of a primer instead, for
@Duck55223 in case he wishes to edit it up to make it look purdy.
First is how the sections are ordered:
*Major Factions
**#category:The Dominion#
**#category:The Eight World's Empire#
**#category:The Morte Imperium#
*Universe Information
**#category:Characters#
**#category:Small Arms#
**#category:Species#
**#category:Starships#
This replaces the second two tabs up top with the tabs "Major Factions" and "Universe Information", and below those two will be the drop-down menus ascribed below each heading. Using the **#category:# tag will allow a second drop-down menu to form, that will automatically draw upon pages inside that category, or you can click the heading itself to go directly to that category page. Using a single asterisk before a heading will denote it as a First Tab, and two asterisks before a heading will denote it as a Second Tab, going under the First Tab directly before it. Also, note that while you can use categories for the Second Tabs, you cannot create an automatically populating list as a First Tab. The reason for this is the way in which "Magic Words" work in the coding of the Wikia CSS, generally just down to coding that needs to be as simple as possible.
*Major Factions
**The Dominion
**The Eight World's Empire
**The Morte Imperium
*Universe Information
**#category:Characters#
**#category:Small Arms#
**#category:Species#
**#category:Starships#
In this second example, the navigation panel will create instead direct-links to the pages noted. This can be used as a way to link important pages that don't belong in specific categories, or factions that are central to the story. Be cautious with this, however, for using this method quickly breaks the navigation panel due to length of page names. This also holds true for the first example, which could lead to having to select a few main factions, and then a final category that lists other factions.
If anyone has any questions on it, feel free to ask, dealing with Wikia coding is actually something I quite like when it works.