If you want, you could install another Launcher....like ADW or Zeam or GoLauncher or some other one...that will reset the icon bar at the bottom and allow you to further adjust those settings.

Or you have to mess with the default theme...which I don't believe it will let you unless you root the phone.

A new Launcher is probably the way you want to go.

Do a google search for best Android Launcher and read a couple articles on what launcher suits you best.