Expand or delete list frame

I have a spreadsheet that somehow has what I think is a list frame in it. It only has 6 out of 8 columns contained in it, and I want to sort ALL my rows by date, but since two of the columns are excluded from the list frame, it doesn't sort them, and all my data no longer matches up correctly. I cannot seem to find a way either to delete this pesky frame, nor to get it to expand to include the currently excluded rows. I know there has to be a simple way to do this, but Help isn't being very helpful...if anybody knows how to remedy this, I would be most appreciative of tips.
Thanks.