To highlight lines in an existing Excel document, click the "File" tab. Click "Open," browse to the spreadsheet and double-click it. Otherwise, Excel opens a new spreadsheet for you to use.

How to Highlight Intervals in Graphs in Excel. The interval between the gridlines in an Excel chart is typically blank, but you can highlight the intervals using an alternating pattern by changing ...

Want to highlight Cell or Row if a checkbox is selected? We show you hHow to highlight a Cell or Row with a Checkbox in Excel.

To change Gridline color in Excel, use Excel Options, apply a custom-colored border to the cells, or apply a custom line color. Full details here.

How to highlight values Excel has a built-in conditional rule that highlights unique values. You don’t have to come up with a special formula—you just run though a few clicks.