Shows or hides the grid guide in the active view window.
When you select this command, the grid guide will be shown in the active view window, and when you deselect this command, the grid guide will be hidden in the active view window. The grid guide takes the form of a faint grid that is superimposed over a view window, and which might be useful if you want to know exactly where the center of a view window is, or if you want to align things horizontally or vertically.
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