Can the grid line color be changed or adjusted?

In order to change the color of your grid lines (or any other lines for that matter), click the Edit menu within the chart and select Global Chart Configuration. On the left side under Charts click Chart Colors. On the Chart Colors window the section section will be Colors. Look for the option that says Gridline. Click the button that says Change... under Display Color to choose a new gridline color. Once you have done so, click Apply and OK to make the change and close the window. 

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