The value of the UseFolderPopViewer key is either true or false. If set to true, FolderPop is used to retrieve and display documents in the ACC Viewer. If set to false, the legacy document viewer is used to retrieve and display documents in the ACC Viewer. By default, the value is set to true.
To change this key, locate the <add key="UseFolderPopViewer" key under the <appSettings> node and change the value attribute to true or false.