This guide describes how to grey out unused cells in Excel in Windows 11/10, apply a solid fill color, use Conditional Formatting, or hide unused rows/columns.

When I started using Microsoft Excel, my spreadsheets were a mess, and I wasted hours trying to make them look professional.

All the cells of negative numbers will become red, while the positive numbers will remain the same. You can create your own custom format in Excel to highlight negative numbers. Select the range of ...