Rulers appear along the top and left side of the main screen to help you measure and align objects. As you move the cursor in the design area, a tick mark on each ruler follows the movement of the cursor. Also, the coordinates of the cursor position are displayed at bottom-left corner of the screen.
To show or hide the rulers, from the View menu:
Grids, like rulers, can help you align objects in the design area. Grids are displayed as horizontal and vertical lines within the design area. They will not show as part of the output.
To show or hide the grids, from the View menu:
The rulers, grids, and all other numeric values that represent a length follow a unit system defined in your software. To change the unit system, right-click a ruler and select the new unit. (On Macintosh, click and hold the mouse button on the rulers.)
By default, the origin of the rulers is located in the lower-left corner of the design area. To change the origin, you can click and drag the origin icon in the upper-left corner of your screen.
You can also adjust the origin's position by using the Ruler and Grid Settings dialog box.