A way to emphasize certain cells and more
How to make gridlines bold in Excel
If you want to learn how to make lines bold in Excel, we'll show you how to add bold border lines, darken gridlines, and increase the thickness of a drawn line.
When adding borders in Excel, you can change the border style to a thicker thickness, making it easy to bold the lines. You can also change the color and position the borders outside, inside, or on specific edges of a cell.
You will then see a thick border around the selected cells.
