A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Apparently AnnaThomasH is ubder the impression she is responding to an Excel for Windows user... Scroll Lock is rare on today's Macs: There is no Safe Mode for Mac Excel; Repair Office is a Windows tool not available in Mac Office.
There are 3 common causes:
- The Mac needs to be restarted, &
- Either macOS or Office [or both] need to be updated, &
- There is some sort of keyboard "helper" or other utility/add-in which is interfering rather than helping.
You've provided no version information for macOS or Office so anything further would be pure guesswork.