- Double-click the underlay to display the Properties palette. 
- In the Properties palette, do one of the following: - Adjust the contrast by entering a new value. 
- Adjust the fade by entering a new value. 
- Turn Monochrome On or Off. 
- Set Adjust Colors for Background to Yes or No. 
 
The appearance of the underlay is updated in real-time as you make adjustments in the Properties palette.