How to show or hide ruler in Windows 8 Paint?
Rulers are used to measure the dimensions of the image.
To add rulers in the paint window,
Step 1: In the View tab → select Rulers or press the shortcut key Ctrl+ R.
Step 2: Horizontal ruler will be displayed at the top and vertical ruler will be displayed at the left-hand side of the paint window.
To hide the Rulers, just uncheck the Rulers option in the View tab.