To change the gridlines to the dash style, which tab should you use in Excel?

To change the gridlines to the dash style in Excel, the Format Ribbon Tab is the appropriate choice because it provides access to various formatting options for charts and shapes, including line styles for gridlines. This tab contains tools that allow users to customize the appearance of elements within their spreadsheet, allowing for adjustments in line types, colors, and widths specifically.

The other tabs, while helpful for other tasks, do not focus on formatting elements in the way that the Format Ribbon Tab does. The Home Tab primarily focuses on basic formatting and editing options such as font changes, cell alignment, and fill colors. The Data Tab deals with data management and analysis tools, such as sorting and filtering data. The Insert Tab is used for adding new elements to a spreadsheet, like charts or pictures, rather than modifying the visual style of existing elements such as gridlines. Thus, the Format Ribbon Tab is distinctly the best option for modifying gridline styles.