What kind of lens do you have?
If you have a "C" lens, that DOF thingy doesn't do anything. It's just for you to look at, and visually see what the DOF is. It does not change anything in lens what-so-ever. If you have a K/L lens, that's a floating element adjustment. You'd rotate it to match the distance for optimum performance.
I have a small hands also. Although it makes it heavier, I find left hand bracket really helps.
Good luck with your new camera.