What method is used to add gridlines to a chart or graph?

The method to add gridlines to a chart or graph involves expanding the axis sections. This is because gridlines are typically associated with the axes of a chart, serving to improve readability and enhance the visual representation of the data. By expanding the axis sections, users can configure the gridlines to display appropriately, either by adjusting their appearance or determining their presence along the horizontal and vertical axes.

In many charting tools, including those within Smartsheet, gridlines may not be toggled on or off directly through a simple setting; rather, the gridlines' visibility and style are often managed through the axis properties. This allows for a more customized chart appearance that can adapt to the specific data being presented.

The other mentioned options do not directly correlate with adding gridlines. For example, toggling on gridlines suggests a straightforward activation without consideration for the chart's settings. Adding to series speaks to including additional data points in the graph rather than modifying its layout. Editing chart style typically refers to changing colors, fonts, or overall aesthetics but does not specifically pertain to gridlines.