You can delete custom annotations and their values when they are no longer required.
What you’ll need
You must have the Application Administrator or Storage Administrator role.
The annotation values must not be used in other annotations or group rules.
In the left navigation pane, click Storage Management > Annotations.
In the Annotations tab, select the annotation that you want to delete.
The details of the selected annotation are displayed.
Click Actions > Delete to delete the selected annotation and its value.
In the warning dialog box, click Yes to confirm the deletion.