You can choose the colors that objects, traps, borders, and highlights will appear in when you select them with the PDF Trap Editor tool. The Preferences menu is available whether the PDF Trap Editor plug-in is closed or opened.
When you select an object, trap, and/or a border in PDF Trap Editor, the selected items will appear in the colors you chose.
When you click the Highlight objects set to overprint and the Highlight traps buttons in the PDF Trap Viewer toolbar, the objects and/or traps will appear with the highlight color you chose.