Hi Robert,
Sorry for the trouble caused at your end.
As per your description, we understand that you’re not able to delete column because of grayed out when you right-click on it. So, we have tested in the same version and can’t reproduce the problem at our end and as you already tried Online repairing the Office application with no success, the other suggestions you can try are:
a. Change the Excel15.xlb to Excel15.old
Close the Excel application> Open the File Explorer> Go to following path “C:\Users\username\AppData\Roaming\Microsoft\Excel”> Rename the Excel15.xlb to Excel15.old> Restart your PC and open the Excel application.
Note: Change the username with your device name.
b. If it doesn’t work, you need to rename or delete the Excel options in the Registry Editor and restart your PC.
Close the Excel application> Open the Registry Editor> Go to “Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel”> Rename or Delete the Options folder> Restart your PC> Open the Excel application.
Note: Before renaming or deleting, make sure you back up it.
In addition, we would like you provide the simple workaround that can be easy for you to delete the columns in Excel worksheet, follow the below steps:
Open the Excel application> File> Options> Quick Access Toolbar> Choose All commands> Scroll to Delete Sheet Columns and select it> Click on Add> OK
Now this shortcut will be added to your Quick Access Toolbar, where you can delete the column by one click.
Please share the updates for moving further.
Appreciate your understanding.
Best Regards,
Chitrahaas