To Designate an Annotation as a Security Marking
1. Select a note or symbol that is standalone, flat-to-screen, and unattached. The Format tab appears.
2. Click Format. The Format tab opens.
3. Click Security Marking. The selected note or symbol is designated as a security marking and is denoted in the Model Tree and Detail Tree with a special icon.
You can toggle the Security Marking button to add or remove the security marking.