Sketcher > Setting Sketcher Environment > To Control the Display of the Grid
  
To Control the Display of the Grid
The grid is hidden in Sketcher by default. To display the grid in both 2D and 3D Sketcher, perform these operations:
Set the sketcher_disp_grid configuration option to yes.
On the Graphics toolbar, click Sketcher Display Filters > Disp Grid.
Click File > Options > Sketcher > Show the grid.
In 3D Sketcher, you can also click Sketch > Setup > Display > Disp Grid.
In 2D Sketcher, you can also click View > Disp Grid.