On the menu you posted, you want to look at each option (especially preferences, home edit, and themes) to see if there is something you can do.
Google Now Launcher is another good and very simple launcher. I can't really describe how launchers work. I mean, they're just home screens. It would be better if you downloaded one and just tried it. You're not going to damage your tablet by trying a launcher, and you can always switch back if you don't like it.