How to Change Grid Line Colors on a Chart With Microsoft Excel. Grid lines add horizontal and/or vertical lines to your graph that aid in measuring graph values.

You can change the default color of chart, graph, treemap, etc. in Word, Excel, and PowerPoint with the helpof these simple steps.

Click one of those colors, and Excel applies it to the legend instantly. This flexibility gives you the ability to see how different legend colors look in relation to existing chart elements.

When the relationship between the charted entities is less important than the individual entities, try using these two chart techniques to highlight important details in Microsoft Excel.