The Set Colors command allows you to define background, selected item, and highlight colors on a
drawing (using the drop-down arrow). Available options include: Background Color, Selected Items Color, and Highlight Color.
If you are using the command in SmartPlant Markup Plus, the 3D > Set Colors command opens the SmartPlant Formats tab of the File Type Options dialog box, which allows you to define the background, selected item, and highlight colors on a drawing.