To make the user interface of ArcGIS Explorer easy to use, many of the less commonly used settings for features such as proxy server authentication, cache management, and symbols have been placed in the Advanced category in the ArcGIS Explorer Options dialog box. If there is a setting that you usually changed in earlier versions of ArcGIS Explorer but that you cannot find where you think it should be in the new ArcGIS Explorer Options dialog box, you might find it among the advanced settings. Note also that the ArcGIS Explorer Button
replaces the File menu and is located in the upper-left corner of the application.
Learn more about the ArcGIS Explorer Options
Learn more about the ArcGIS Explorer button