On occasion, some files used do not really have a message field. If a message field is not identified, then some of the sizing options are not available (grid View and message size). That also means horizontal scrolling cannot be turned on if needed for that file.
The problem is that identifying a field as the message field prevents you from naming the column. Sometimes, you just want to keep the column names as is.
 If the message field could be renamed (i.e. %m{whatever} ) this would be much more flexible in these situations. I could keep the columns named as received and still have the grid view and "message" size options.

Granted, in most cases the "Message" column header is fine….but not all cases.
Regards,
Bill G.