From this tab the Margins & Grid color and the Margins location can be set.
Besides helping to align, rotate and center the image, the Margins are used as a cleaning tool. Learn More.
To view the Margins Guides and/or the Grid is required to left selected the View > Guides, and View > Margin Guides menus.
When the Margins and the Grid are visible, sometimes the image may appear as damaged with horizontal and vertical streaks, but that is only an screen artifact.
Use the controls in this Tab to select where the Margins appear and its color. The Grid color can be set also there, as well as its size.