You can use Resize Floor to change the floor size by manually dragging the borders. When you click Resize Floor, grips display at the corners and midpoints of the floor edges. When you drag a grip, a value input box displays the floor dimension.
The new floor size is saved in the Floor/Grid Settings dialog box. If Auto Size is enabled, Resize Floor also changes the minimum floor size settings.
Use Reposition Floor when you wish to move the floor about the X, Y, or Z axes. A triad appears at the 0,0,0 factory floor origin. Select the X, Y, or Z shaft of the triad and drag the floor in the desired direction. You can also enter a precise translation value in the Heads-Up Display (HUD). 