This alert banner is generated from the Alert view (a Block placed in the Alerts region of the Block Layout). The All Alerts view is used to manage alerts. A link to that view is in the Tools menu.
Content Types:
Alert
Paragraph Types:
-
Views:
Alert
All AlertsTemplates:
views-view-unformatted--alert--block-1.html.twig
views-view-table.html.twig