A rectangular grid can be overlaid on the screen to assist in measurement. The size of the grid rectangles can be adjusted using the Screen Grid Spacing dialog. To display the dialog select the Screen Grid Spacing item on the Tools menu.

When the Screen Grid Spacing dialog is displayed, the screen grid will also be displayed regardless of whether it was originally displayed. When the dialog is closed, the screen grid will removed if it was not originally displayed.

The grid spacing is always specified using pixels. The spacing can be set on the horizontal and vertical directions independently or they can be linked to form a square grid by checking the Link box at the bottom of the dialog. To set a spacing either enter a pixel value in one of the text fields or use the up/down buttons next to the text field. The minimum grid spacing in 40 pixels and the maximum spacing is 1000 pixels.