Disable the Alert Bar for an Alert Center category when you no longer want alerts from that category to display as a banner on your site. You can re-enable the Alert Bar at any time if needed.
Who can use this feature?
System Administrators | Owners
Instructions
Navigate to Modules, click Content, and select Alert Center:

Select the category that has the alert bar enabled:

Click Actions for the category:

Select Modify:

Navigate to the Show Alert Bar section. Select the Disabled radio button:

Click the Save Changes button:
