You need to hit the Clear Options checkbox (it should actually be a Command Button) toward the bottom of the Options sheet. That was the most efficient way I could think of doing it on Friday with me in I wanna scoot mode.
As for formatting the CheckBoxes, they're ActiveX controls, so goto View-->Toolbars-->Control Toolbox. Enter Design Mode (the Speed Square looking thing), then View-->Properties. ActiveX controls are much easier to work with in regards to formatting than Forms controls.
Hope that helps,
Smitty