To set the grid’s interval, type new values in the X and Y Interval boxes. For example, if the grid is in 1-inch units and you specify an interval of 10, 10 grid points are displayed per inch.
To add a guideline, starting from the upper-left corner of the Layout Editor, drag the pointer onto the page. To remove a guideline, select its triangle in the ruler and drag it off the page.
To set the color of object boundary borders, click Styles, click the Color box, select More Colors, and either choose a predefined color from a palette or create a custom color by clicking Define Custom Color.
To set the color of grids or guidelines, click the Color box, select More Colors, and either choose a predefined color from a palette or create a custom color by clicking Define Custom Color.
See also 

To use the drawing aids