The tools on the Grid toolbar and the Grid menu can be used to display the grid, size it, and change its origin.
Hotkey:* Alt + G
Displays or hides the grid. This command is a toggle function.
Doubles the spacing of the grid, making it less dense.
Divides the spacing of the grid in two, making it more dense.
Set Grid Origin
Select the new origin for the grid, or enter coordinates in the Coordinate Fields. You can use Set Origin to align the grid to a particular point, then use the grid to set future distances.