To use gridlines
Step 1
Click the dimensions pill found at the bottom left of the proofing screen and select use gridlines. Or, click the gridlines icon found in the magic tools.
Step 2
Click and drag from the gridlines area to draw a vertical or horizontal gridline.
Tips
To change the unit of measurement, in the dimensions pill click the units and select a different option (pixels, millimeters, inches, etc)
Use the keyboard shortcut g to turn the gridlines on/off.
To change the color of the gridlines, click the orange square in the top left corner of the gridlines. You can set a custom color too.
Click here to learn more about our ruler tool.