Kuroyume,
I was reading your suggestions and I hate to be a pest but. . . .  

1. Do you mean the floor grid or the Ground Plane prop?  For the latter, just turn it off in the menus: Display->Guides->Ground Plane (Ctrl+G).  For the former, you cannot change that at all - it represents Y = 0 and there is no changing it.  The solution: change where your figure and world are in relationship to the floor.

I'm thinking it's the floor grid.  But how do I change the figure and world in relation to the floor?  If I have 20 objects, Santa, sleigh, deer etc -- do I move each one individually or is there a way to move them all at once????

Thank you.
Bev