To Control the Background of Dimensions Displayed in Sketcher
To set the display, color, and transparency of the dimension background in Sketcher, perform one of the following operations:
• Set the sketch_dim_background_color, sketch_dim_background_color_rgb, and the sketch_dim_background_trans configuration options.
• Set the Dimension Background, Color, and Transparency options for Sketcher in the Dimensions, annotations, notes and reference designators display settings area of the Entity Display page in the Creo Parametric Options dialog box.
• Click > > 
Dimension Background Display.
Dimension Background Display.