A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hello,
Add-in conflict, application error, outdated application, and file damage are a few of the possible reasons why you are experiencing issues with drop down list in Excel. We would like to know if the issue is happening to a specific file. If yes, repair the damaged file by following these steps.
If the issue persists, we suggest that you repair Office application either by going to the Control Panel or by uninstalling and reinstalling it. Here’s a link that would walk you through the steps on how to repair your Office application.
Let us know if you need additional assistance.