A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I noticed that you are running Excel 16.112 (Build 26081010). That was released on August 11, 2026. As of September 10, Microsoft lists 16.112.4 (Build 26090911) as the latest release, including additional Excel quality and performance fixes.
I suggest trying these steps first:
- In Excel, go to Help > Check for Updates.
- Install all available Microsoft 365 updates until Excel shows 16.112.4 or later.
- Completely quit Excel with Command + Q, restart the Mac, and test again in a new blank workbook.
If updating does not resolve it, could you please confirm two things?
- Can you edit the cell contents from the formula bar, or is there no cursor there either?
- Does the same issue occur in a completely new blank workbook?
Those two tests will help determine whether this is the current Excel input issue or something limited to the workbook/preferences.