Click Select on the vertical toolbar.
Select Grid Plane in the Locate Filter box.
Select the grid plane to move.
You must select a continuous set of grid planes of the same nesting level to modify. That is, you cannot select the west-most grid plane and the east-most grid plane to modify without selecting all intermediate planes.
Click Grid Plane Position and then specify the new plane position by clicking in the graphic view.
Type a new offset value in the Offset box.