Enter layout mode on this layout.
Open Layout setup.
clear the "Delineated Data" check box
Now go to: http://www.filemaker.com/company/contact/feature_request.html And post a feature request asking FileMaker to not make this the default setting on new layouts in future versions of this product as you will have to go here and clear this check on most of your new layouts. This is also a layout set up option that should not affect preview mode as it currently does as it's an option for helping you make the current record in a list view stand out while the user is editing data.