How can I highlight an enzyme site that is particularly important?
Highlight One or Two Enzyme Sites

Select the enzyme site you want to highlight. If desired, Shift-click on a second enzyme site to select both sites for highlighting.

Click Enzymes → Highlight Selected Enzyme Site.

The selected enzyme site is now highlighted in gold.
Clear Enzyme Site Highlighting

To remove the highlighting, click Enzymes → Clear Enzyme Site Highlighting.

This action will clear highlighting from all enzyme sites.