You can hide, show, and remove application servers in the Explorer panel of Enterprise Manager.
In the Explorer panel of Enterprise Manager, right-click the application server and click Hide.
The server is hidden.
In the Explorer panel of Enterprise Manager, right-click the Servers node and click Show All Servers.
The hidden server or servers reappear.
In the Explorer panel of Enterprise Manager, click the Save Current User Preferences icon.
If you change the configuration and you attempt to log out without saving the preferences, then Enterprise Manager displays a prompt that enables you to save the preferences.
You must be an Enterprise Manager user that has the Manager role.