This article explains how to color tabs in Excel. Instructions apply to Excel 2019, 2016, 2013, 2010, Excel for Mac, Excel for Microsoft 365, and Excel Online.
How to Change the Color of the Worksheet Tabs in Excel
When you can't find a worksheet because your Excel workbook contains too many worksheets, color the sheet tabs. Here's a quick way to change the color of a tab in Excel:
Select Tab Color to open the color palette.
Click on a color to select it.