Hi RuthWhitney,
I go through the post carefully. per your description, I think you may open the workbook in Excel for the web. And you cannot select some cells in it. if so, I would suggest you click “open in Desktop App” at top(I don’t know if you copy the sheet and open it in ), check if you can select these cells. As you can see in screenshot below:
If you can’t, I would suggest you go to Review tab in Excel, check if the sheet is protected, if it is protected, try to unprotect it.(sometimes you cannot select cells because is protected and is prevented from selecting some cells. For more information: Lock or unlock specific areas of a protected worksheet)
As for the “ large plus sign” it is an expected behavior when you edit workbook in Excel desktop app.
If suggestion above doesn’t help, could you please share information below with us for further troubleshooting?
- How do you copy the sheet locally?
- Does the same issue happen on other workbooks in OneDrive?
- Could you please share some screenshots of the cells that cannot be selected?
Regards,
Clark