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It depends on where you are searching from.
When you perform a search from the My Apps 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, click Search on the Global bar), QuickBase searches only on the contents of that application. Read more: https://www.quickbase.com/user-assistance/default.html#quick_find.html