Settings that you make at the application level only affect one application at a time (including all collections and sites that belong to it). To find these settings, log into your SharePoint central administration site, go to the Application Management tab.

Figure: The Application Management tab of the SharePoint central administration site

The following links on the Application Management tab are relevant for Search & Preview:

• SharePoint Web Application Management > Manage Web application features: enables you to activate or deactivate the Search & Preview-Search-Box feature for each application. See “Activating and Deactivating the Search Box for an Application” for details.
• Search & Preview for SharePoint > Manage Search & PreviewModules: enables you to make application-level search-tab and Search-Box settings. See also “Managing Search & Preview Modules”.

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