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It depends on where you are searching from.
When you perform a search from the My QuickBase page, you are searching the Name, Description, and Manager fields of all applications. The search results list all of the applications to which you have access that fit the search criteria.
However, when you are performing a search within an application (To do so, select Find from the menu), QuickBase searches only on the contents of that application. Read more: https://www.quickbase.com/help/quick_find.html