In CRM 2013 Advanced Find was not on every page, so if you were on an individual record you had to navigate back to a grid view or a dashboard to open it. Then navigate back to the record you were on.
With CRM 2015 the Advanced Find button is now available from all pages in its new home in the navigation bar at the top of every page.
Details : http://cargas.com/blog/microsoft-crm-2015-universal-search-advanced-find-improvements/