How To: Use highlight color to help find features that correspond to specific selected records
The highlight color is used when clicking on a record or a field and only viewing the selected records in ArcMap. A highlighted record does not effect the selection; its purpose is to help find features that correspond to specific selected records. When a record is highlighted in an attribute table, the corresponding feature is displayed in the highlight color in the map.
Zoom into an area of a selection set.
Open up the Table View (right-click the layer in the Table of Contents > Open Attribute Table).
At the bottom of the table view, click the 'Show: Selected' button.
The selected features are already selected. If the left-most box in the table adjacent to the record desired is clicked, it selects the feature in the map using a different, larger symbol.