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Help > Building a 3D Model > Referencing Tools > Referencing Marks > Reference Mode and Pane > Reference Helper Highlight 
Reference Helper Highlight 

During Referencing Mode when a point or silhouette is selected on an oriented source photo, the best potential match(es) will highlight in the destination photograph.  The color of the highlight can be set in Preferences - User Interface on the Color page with the “Potential Reference” color setting.

The light blue mark is the potential reference on the destination image: