Setting up a layer
- Select View > Layers... from the main menu
- Click Create new layer in Diagram Layers dialog box and click Close
- Name the newly created layer as Annotation
- Right click on a callout on the diagram and select Layer > Annotation from the pop-up menu
Hiding a layer
- Select View > Layers... from the main menu
- Uncheck Visible of Annotation layer in Diagram Layers dialog box and check it again for testing the effect