All you have to do is click every button and then play with it! I set every colour I could see to something different but equally godawful, and hit generate, and then sure enough, learned what each option controlled. And for the weapon selections, if "XYZ" is a chainsword, then "XYZ/ABC" is a chainsword and something. And if that something is a bolt pistol, then "ABC/DEF" is a bolt pistol and something. You don't have to know what it says, you just have to play a game of memory! ;)
As to the bars, I'm not sure what you mean. Could you take a screencap and share it? I've not had any problems with scrolling. If there are things you can't see, there is an option to "pin" some of the slide-out menus, so you may have hit that by accident, and hidden everything else.