Creo Simulate > Reference Links > Relabel Contour
  
Relabel Contour
Use Format > Contour Label Density to change the number of lettered labels that appear on the contour plot. You specify label density on the Result Window Definition dialog box.
Labels are only visible for the contour plot if you select the Label toggle on the Visibilities dialog box
When you define the result window, you set the initial state of labels. See Contour Results Display for information.
When you select the Format > Contour Label Density, Creo Simulate prompts you to enter a new value for label density. The density is an integer from 1 to 10. Use lower numbers to get more labels.