How to delete a theme from a file

[memartin]

I was given a file to edit. This file was created with a theme "Classic Office 2" using Arial fonts. I cannot copy and insert new lines into the file. How do I edit the theme or delete this theme in order to get an editable file?

 

[texasalynn]

the file probably has all lines formatted. Select the "non used" cells and press Edit - Clear - All. Save the file, then try to insert lines.