Wizdom Service menu is a link panel that provides deep links to specific content and services from all pages in a site collection. The link panel is normally hidden and appears when the service menu icon is clicked.
The service menu is often used to provide corporate as well as personal deep links to relevant content, which saves space on both the front page and in the mega menu.
Please note that the service menu module is designed for the classic experience in SharePoint and Wizdom and its not available on the modern experience.
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