Question

You notice that there is a column initial missing at the top of the Excel Worksheet. What does this tell you about the Worksheet?

That a Column has been hidden
That a Column has been deleted
That a Column has been resized

Answer 1

This means that if there are rows/columns that are not visible to either the left or top of your spreadsheet, these cells will remain unviewable once Freeze Panes has been activated. This essentially prevents you from accessing (unhiding) them.