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+ Options dialog box.
• Click > > 
Dimension Background Display.
Dimension Background Display.