By default, guideline color is set to a medium blue. However if you are working with blue objects you can change guidelines to a new color in order to get a better contrast.

1. Double click on a guideline to open the Guidelines Docker.
2. Open the Guideline Color flyout list (a), and choose a different color.

Note: You also can add different colors to 2 or more guidelines. Just repeat the steps above for each one.

Tip provided by Silvio Gomes, CorelDRAW Master, Artist and Graphic Designer.